Grub list uuids. I am assuming this is due to the identical UUIDs of the two efi partitions that hold the respective Windows Boot Loaders. /boot/loader/entries directory seems to be populated with correct . Apr 14, 2016 3 0 1 31. Per default the OS seems to use a UUID to "find" the boot-device. But in this scenario, there are actually three UUID problems. lst and do a grub-update, and a grub-install too. He just want the updates automatically have it. ls /boot shows them but won't boot) just rebuild grub with the second command. 0-29-generic and initrd. Also need to check the GRUB_CMDLINE_LINUX="" line. List of GRUB module names separated by spaces that will be loaded at the start of grub. On handshake devices interchange there UUIDs to get to know each other. The downside of UUIDs is that you have to scan all devices for content to find them. So even if you put UUIDs in every configuration file, chances are high that on the lower level it's still drive numbers. Here are some quick examples on using it. I let a distro to use the UUID but if it fails to boot then I alter When I list UUIDs with blkid it has indeed changed. Then, I mounted the USB drive to /mnt and ran grub-mkconfig -o /mnt/boot/grub/grub. Retrieving the UUID (Universally Unique Identifier) of a drive in Linux can be useful in situations where we need to configure specific options for a particular drive. cfg file in it. png” in the “grub/themes/icons” directory, it will be displayed for Wanting to delete the Windows 10 menu entry from Grub menu I thought about adding the parameter "GRUB_OS_PROBER_SKIP_LIST" in the /etc/default/grub file. ‘GRUB_DISABLE_UUID’ Normally, grub-mkconfig will generate menu entries that use universally-unique identifiers (UUIDs) to identify various filesystems to search for files. If installing grub-efi-amd64 the package grub-pc is removed. For efi blkid is unreliable for this use-case. Drivers numbers are BIOS/UEFI/hardware dependent and "unstable", partition Sudo blkid lists all kind of mounted stuff, including /dev/loop. It is the successor to the traditional GRUB boot loader—now called “ GRUB Legacy ”. Matthew Matthew. cfg more than once, so stopped using it. Share. conf that gets generated still contains device UUIDs. 7 kB of archives. mount /dev/sdax /mnt grub-install /dev/sda --boot-directory=/mnt grub-mkconfig -o /mnt/grub/grub. Others have a bunch of UUIDs. UUID stands for Universally Unique Identifier and is a mechanism to give each filesystem a unique identifier. 6. I tried using both Debian rescue mode and a grub rescue disk, but wasn’t able to get it working. However, if I've used UUIDs (and I think I have), this shouldn't Here is a real life example of why you should be using UUIDs instead of /dev/XXX when mounting in fstab. The file fstab contains descriptive information about the filesystems the system can mount. In terminal Boot OS from grub menu. I wanted to adjust these new entries by editing /etc/default/grub, but it seems some settings are ignored or overridden by the update-grub and grub-mkconfig scripts. Linux. For efi You can also use the 'uuid' command from GRUB's Command Line Interface to get a list of file system UUID numbers 'on the fly' and then boot, For example, In the end the solution was actually simple as the scripts that make your /boot/grub/grub. cfg do most of the work for you in finding UUIDS for your boot partitions. echo "set root='`${grub_probe} --device ${device GNU GRUB Manual 2. lst. This is achieved by commands kfreebsd_module, knetbsd_module_elf, kopenbsd_ramdisk, initrd (see initrd), initrd16 (see initrd16), multiboot_module, multiboot2_module or xnu_ramdisk depending on the loader. I go exactly the opposite. The grub entry ("What I see when I press 'e' in the grub list") for the new windows would run the following (replaced my UUID with 1111-1111): Jot down the UUID and then boot to the system and list UUIDs of all filesystems with blkid (as root) or lsblk -f, and see which drive the filesystem that has the UUID from grub shell is on. From GRUB command line, cat (hd0,gpt9)/boot/grub/grub. I tried booting into Arch with grub, and I'm still being kicked into the emergency shell instead, with the exact same output . GRUB_DISABLE_LINUX_UUID=true GRUB_ENABLE_LINUX_LABEL=true Then edit the 2 lines in your /boot/grub/grub. CentOS now uses UUIDs by default. From the man(1) page for fstab(5):. 72 smbios When given --get-uuid, return the value of the UUID (sixteen bytes) at offset bytes into the selected SMBIOS structure. When I upgrade my system, I receive a warning message like this: WARN: /dev/disk/by-uuid/FFFF-FFFF does not This chapter describes how to configure GRUB 2, the boot loader used in SUSE® Linux Enterprise Server. You can use UUIDs instead of the traditional (hdx,y) method with this command: search --no-floppy --fs-uuid --set XXXXXX (replacing XXXXXX with your partition's UUID. However you can try the Boot-Repair utility, or follow these instructions. 16. So those UUIDs have a completely different range of meaning, but all serve one purpose: interoperatability. Sets the boot menu entry that is booted by default. I figured this might have something to do with UEFI boot, so I went into the BIOS settings and made sure it was set to legacy boot. Currently I’m trying to find a UUID for Tara to spawn her back in after she disappeared in a Gale origin run. cfg in the same directory it itself is located, and this is used on modern Debian and derivatives (and increasingly on other distributions too) to just identify where the main /boot/grub directory is. For generating the GRUB If you generate a UUID for the device (e. Follow asked Aug 6, 2016 at 19:33. A full version of the first line could look like: search --set=root --fs-uuid <uuid> --hint hd8,gpt5 That hint could be, in the most cases, safely omitted (or fixed to actual values without any risk of ending up with an unbootable system). asked Feb 17, 2013 at 19:01. Depending on the computer I use it in, the device identifier may be different (going from hd0, to hd1 or hd2, depending on the other drives present). Can this be done? It would simplify the booting from (loop mounted) iso file. Now, I realize I can use the console 'cat' command to just list the /boot/grub. whereas blkid lists a lot less. Firstly I didn't think of it and secondly I don't know how to get to the grub prompt anyway Here is a list of all the shell commands I have that include the word grub: # If there's a filesystem UUID that GRUB is capable of identifying, use it; # otherwise set root as per value in device. cfg If you are sure it is not throwing errors on the dracut --regenerate-all previous made (i. Check UUIDs for the disks using the command: sudo blkid 2. After install grub will not boot Windows, but by changing boot drive boots fine. why it's undefined, Evaluate agruments as GRUB commands • export: Export an environment variable • false: Do nothing, unsuccessfully • fwsetup: Reboot into the firmware setup menu • gdbinfo: Provide info for debugging with GDB • gettext: Translate a string • gptsync: Fill an MBR based on GPT entries • halt: Shut down your computer • hashsum: My intention is to read the UUID of the GRUB's root partition (which is also the partition which holds the iso files), from within grub, at boot time. This is because all the partitions are referred to be their UUIDs instead of the kernel-assigned name (sda1, sda2, etc). error: unknown filesystem. cfg is being updated, when loading into grub and editing the main boot entry there, "iommu=on" is missing. In this tutorial you will learn: How to retrieve, generate, and change the UUID of a partition; Retrieving and setting a new UUID for a partition on Linux . Once you are in grub command line type ls to list all I expected to maybe see uuid refer to not the partition with Linux files but other one on the disk, but the uuid from GRUB file was not in list of ones that I see when I run blkid starting Linux from live USB Ubuntu Studio. The format of the UUID is a series of hex digits separated by hyphens, like this: c1b9d5a2 When I list UUIDs with blkid it has indeed changed. The line you are looking for is: if [ x"${feature_menuentry_id}" = xy ]; then menuentry_id_option="--id" else menuentry_id_option="" fi Gives you the value of feature_menuentry_id and if it's equal to y then it will add the --id parameter to your menu entries:. conf have timeout=0 , so it boots directly to Fedora without showing any grub menu. One thing that bothers me is that the UUIDs change when installing a new system, so other bootable partitions no longer can access the partition in which a new distro was installed. Home; About Me; Archives; Search; Dark Mode; Boot from USB through grub menu Boot OS from grub menu Dec 01, 2020. The same can't be said for UUIDs. also remember to update your /etc/fstab file. GRUB_DISABLE_LINUX_PARTUUID: As you can see, the root drives are set via uuid, so cutting and pasting a solution will not work for you. I'm using UUIDs to tell GRUB2 what device is which and I'm using UUIDs in /etc/fstab. GRUB_DEFAULT=2 boots the third (counted from zero) boot menu entry. If you like the idea of using UUIDs to avoid unreliable BIOS mappings or are struggling with GRUB's syntax, here is an example boot menu item that uses UUIDs and a small script to direct GRUB to the proper disk partitions for your system. Generate version-1, version-3, version-4, version-5, and time-based UUIDs. EDIT P. If you have installed an older version of grub this blog post blkid_probe_lookup_value sets uuid to point to a string that belongs to the pr structure, which is why the argument is of type const char *. GRUB 2 has been the default boot loader in SUSE® Linux Enterprise Server since version 12. So, in my specific case, the relevant part of grub. I also booted into the primary drive, changed the FSTAB and GRUB to use UUIDs instead of labels. It's quite hard to debug. I boot into Linux Mint fine, but when I try to boot into Ubuntu, I get a message (from memory, may be incomplete) that the loader can't find /dev/disk/by-uuid/<old UUID>. This may be needed if the GRUB boot is in a LVM partition. I have uncommented that line in /etc/default/grub which eliminated the use of I would appreciate help and hints to solve a problem with the GRUB bootloader. It will be formatted as lower-case hyphenated hexadecimal digits, with the first three fields as little-endian, and chroot /mnt/sysimage dracut --regenerate-all -f && grub2-mkconfig -o /boot/grub2/grub. disable_os_prober: ' false ' # List of space-separated FS UUIDs of filesystems to be ignored from os-prober # output. A YaST module is available for configuring the most important settings. I decided to see if GRUB itself had any issues with # GRUB-install --no-floppy /dev/sdb1 # update-GRUB GRUB> find /boot/GRUB/stage1 GRUB> root (hd1,0) # result of above GRUB> setup (hd0) There's definitely a mismatch, because sdb, which has 3 partitions, seems to be (hd2) at the GRUB rescue> prompt, but (hd1) when actually booted. 2. firmware) and may actually differ on just reboot, ie. The format of the UUID is a series of hex digits separated by hyphens, like this: c1b9d5a2-f162-11cf-9ece-0020afc76f16. Follow edited Apr 9, 2013 at 8:24. GRUB 2 will find and create a menuentry for the Windows (Vista) Recovery partition. boot; partitioning; grub2; clonezilla; uuid; Share. /. However, if I've used UUIDs (and I think I have), this shouldn't GRUB_OS_PROBER_SKIP_LIST: Date: Wed, 10 Jan 2024 23:16:52 +0100: User-agent: Mozilla Thunderbird: Hello, GRUB documentation says: ‘GRUB_OS_PROBER_SKIP_LIST’ List of space-separated FS UUIDs of filesystems to be ignored from os-prober output. cfg file is different, it is used to set the root file system. Obtain the UUID of the root partition and configure the boot item in config file to use the UUID of the root partition, as follows: Log in as root user. The iso-scan/filename is for casper script in kerenl environment. To The relevant menu entry in my grub. cfg. grub. Could it perhaps be related to the fact that it is an SSD drive and/or the way that grub searches for devices? I am beginning to think this really is more of a grub issue than an Arch issue. When the system is booting up, the LV containing the root filesystem is not activated by UUID, but by VG/LV name. The udev rules infrastructure (defined in the /etc/udev/rules. if there are more than one partition/drive with the same UUID, what happens from there is undefined as its a condition that should never exist. cfg to make sure the UUIDs match up with the values in /dev/disk/by-uuid, and make sure that everything looks right in /boot/grub/device. Unfortunately, it seems current GRUB versions do not yet support using partition UUIDs. All Linux filesystems support filesystem UUIDs; FAT and NTFS filesystems don't support true UUIDs, but are still listed in /dev/disk/by-uuid with a The value of GRUB_DISABLE_LINUX_UUID is used by update-grub and the scripts in the directory /etc/grub. One can set a password to protect the boot menu entries and the command-line shell of the GRUB boot manager (see the official manual and the Red Hat manual). There are several UUID versions with slightly different purposes. The option --part-uuid is currently only implemented for MSDOS and GPT formatted disks. 0-109-lowlatency-advanced-79ff4213-58cc-4410-9b21 Just installed another hard drive and noticed that grub automatically added the necessary menu entries to boot off it. If it is present in yours, delete it or comment it out and rerun update-grub. just map the UUIDs to the numbers used. Then, I tried to add my kernel details to grub. If in partition table of hard disk, then It does provide the UUIDs and device mappings of machine 2’s internal HDD, however. The application allows the user to add, remove, freeze, rename and reorder boot menu items. (This answer tries to explain what is happening and offers a (possible) patch. cfg file as follows : GRUB_SAVEDEFAULT=true # Preload both GPT and MBR modules so that they are not missed GRUB_PRELOAD_MODULES="part_gpt part_msdos" # Uncomment to enable booting from LUKS encrypted devices #GRUB_ENABLE_CRYPTODISK=y # Uncomment to use basic console GRUB_TERMINAL_INPUT=console # Uncomment to disable graphical terminal This uses the current names of the md devices and their UUIDs and creates a devicemap for GRUB2's perusal. Have a look at /etc/fstab and confirm the uuids there by issuing the blkid command for each device. GRUB avoids this problem nowadays by using UUIDs or file system labels when generating grub. While adding extra custom menu entries to the end of the list can In the realm of technology, identification is critical. The toram is a nice trick when we have more than 16GB memory. I also have fstab setup to mount sda7 so I can copy configuration files to the new OS. From man blkid: Note that blkid reads information directly from devices, and for non-root users it returns cached unverified information. Whereas the short uuid are ntfs type partitions. It might be useful to be specific what UUID you checked. The mint 14 files in /etc/grub. Let us see how to update /etc/fstab using UUID under Ubuntu Linux or any other Linux distro. It is better to use lsblk --fs to get a user-friendly overview of filesystems and devices. The icon is selected based on the *classes* specified for the menu entry. The grub. /boot/grub/grub. cfg” file. The “Huge UUID” entry, however, runs into the kernel panic shown above. cfg file. Certainly not to /dev/sdc1 which is the block device housing the encrypted The only trouble is that the initial install created the EFI/ubuntu/grub. efi starts grubx64. Security by obscurity does not work. Add the following lines to your /etc/defaut/grub:. (So yes, it is more reliable as the UUID won't change when a drive from the chain is out. T his page explains the UUID concept of Linux ext3/ext4 and other disk partitions and storage devices. MiZoG Level 10 Posts: 3273 Joined: Sat Jan 27, 2018 1:30 am Location: Athens, Greece. It can describe danything: primary service, important characteristic, other thing with custom UUID (custom UUID usually used in Manufacturer Specific Data). d/. Set this option to 'true' to # disable this. g. However, if you want to preserve bootability Its working fine. When the support is added it'll be available under the search. I can change the 2nd uuid at startup (with E) and it boots sda9. No problem!! Get device name from ls -l /dev/disk/by-uuid where you find your UUIDs and devices they are linked to. 58 probe Command: probe [--set var] --driver|--partmap|--fs|--fs-uuid|--label|--part-uuid device Retrieve device information. cfg) shown below, the menu item identifier for the last item in the submenu is 'gnulinux-advanced-79ff4213-58cc-4410-9b21-b6db63e1da04>gnulinux-5. However, if you know what you want and what you are doing, you don't need to use Simple configuration at all, as you can write your grub. When I list UUIDs with blkid it has indeed changed. Remember that Grub starts counting with 0, not 1. Added /list. cfg file is as follows: I checked my /boot/grub/grub. ? Remove list [details: string], in which details: string must be one of ids stats uuids. Probably device naming/numbering will be changed. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn. grub> search --no-floppy --fs-uuid --set=root 7DF7-8065 grub> trust Background: Initially shimx64. The setup doesn't rely on the names, I still would like them to The grub. -d--device. 10 desktop. grub-mkconfig does have some limitations. os_prober_skip_list: - ' 65168eab-b6ef-4bd0-8da0-c00acaa8e37d ' - ' 5df7e569-230b-4579-bd26-358c2bc60cad ' # Normally, grub-mkconfig will generate top level It seems that even though /boot/grub/grub. It doe snot mean exactly "Service" UUIDs. Anywhere else TAB lists possible device or file competions. cfg This will install GRUB stage 1 to the MBR of sda, stage 2 and the configuration data go to the file-system on sdax. Print the version number of GRUB and exit. When an If you used ext for it: tune2fs /dev/{device} -U {uuid} From man tune2fs-U UUID. coincidentally /etc/fstab contains UUID=12345blabla /boot xfs defaults 0 0. I then installed Linux Mint to sda1. - Aforementioned solution somewhat works, it boots me into my system but I see no startup messages(I like those startup messages), and there is obviously something wrong if this is happening anyway. GRUB is a multiboot secondary bootloader capable of loading kernels from a variety of filesystems on most system architectures. Also, there is lsblk and findmnt for already mounted filesystems. In systems where resources are precious, it could make sense to use a more compact format. So without being able to use In this guide, we’ll go over several command line methods to retrieve the UUIDs of hard disk partitions. The example I did apt-get install update and apt-get install upgrade and after a reboot I get the following grub screen:-----GNU GRUB version 2. So, the new UUID has to be This is achieved by GRUB loading a specially made small image and passing it as ramdisk to the kernel. blkid is mostly designed for system services and to test libblkid functionality. The big uuids are ext4 or swap type partitions. UUIDs are 36 character strings containing numbers, letters and dashes. sudo tune2fs /dev/sda7 -U <old UUID> sudo grub-update and reset fstabs appropriately, and everything worked. Here are the three places the root partition's UUID needs to be: In /etc/fstab on the line where the root partition mount is described, and; In /boot/grub2. When I boot off of the live USB, I am able to install Fedora as normal. Anyone with a Super GRUB2 disk will be able to The ls command has been used to get a list of all devices along with the uuids. For efi chainloaders it’s <UUID>@<EFI FILE> But the 17. If you used ext for it: tune2fs /dev/{device} -U {uuid} From man tune2fs-U UUID. The message: Warning: /dev/disk/by-uuid/<uuid> does not exist is a major clue. However, there are several gotchas to watch for when using them in real systems. d directory) provides With a triple boot system on BIOS/Legacy disk, I tested a solution to avoid the Windows Boot Manager menu triggered by the Linux GRUB (see here) and make the Windows systems start directly from the GRUB without passing by WBM. Bedrock Edition; list Shows the names of all currently-connected players. I have a system with root LUKS encryption. Similarly to authconfig commands issued on command line, authconfig commands in Kickstart scripts now use the authselect-compat tool to run the new authselect tool. Remember to use "set pager=1" to scroll page by page The grub ls -l command will show all devices and partitions with their UUID-s. I read that if I change the TIMEOUT to 10 and TIMEOUT_QUIT to true, that I'll be able to access the Grub menu. In RHEL and related distributions (or basically any distribution which uses dracut to create its initramfs), When I list UUIDs with blkid it has indeed changed. img-2. I just strip that then it progressed more. 13 17w45a /list can now be run in singleplayer. How can one intall Ubuntu yet have it keep the old UUID mount /dev/sda2 /mnt arch-chroot /mnt grub-mkconfig -o /boot/grub/grub. cfg directly. I also added the check_signatures here again, just to be sure, but this alone made no difference as expected. Here are examples (your output will be different, but similarly formatted). Print a summary of the command-line options and exit. cfg is current using update-grub to make . We’ll also show you how to generate UUIDs and change a partition’s UUID. cfg file, I changed all the lines referencing the old /root partition (/dev/sdxn) or its UUID (UUID=[old partition's uuid] ) to reference the new one. So that is just UUID and you AwesomeMachine, Think Grub1 can use UUID and the OP post #1 shows that is what he is using. 2 Understanding UUIDs # A UUID (Universally Unique Identifier) is a 128-bit number for a file system that is unique on both the local system and across other systems. Output [edit | edit source] Command Edition Situation Success Count /execute store success /execute store result Any: Java Edition : On success: 1: 1: the number of players: Bedrock Edition: On Overview. It is responsible for loading and transferring control to the Linux kernel. 4 ns) /0/3a/2 memory 16GiB DIMM DDR4 Synchronous 2666 MHz I have noticed some interesting behavior: In the menuentry in my /boot/grub/grub. Thread starter kano; Start date Sep 17, 2019; Forums. From Wikipedia I understood Linux uses random UUID, however I could not find info on where UUID's are stored. One big factor in favor of integer IDs is they're easy to scale and optimize. cfg doesn't correspond to any of the many UUIDs present on the system (yes, I have checked and rechecked). So assuming the above was done correctly, you should have the correct device names already. So, I didn’t want to wait and created symbolic links in /boot for the latest kernel. But I gave it the grub path with (dev, part) prefix. list uuids Player UUIDs are shown alongside names. 8. Do you have any recommendations for that? Thanks for your help! Top. This way even if it is corrupted I stand a chance of repairing the install manually or at least booting manually with some difficulty? boot; grub2; partitioning; hard-drive; uuid; Share. So you can skip the fdisk and blkid steps most people mention. haziz. Press i to enter editing mode and change the root partition to the UUID format, for example, from To solve your current problem, you'll have to change the UUID(s) in /etc/fstab and /boot/grub/menu. insmod bl Other programs besides udev, such as LVM or md, might also generate UUIDs, but they are not listed in /dev/disk. kano New Member. For btrfs it will be sudo btrfstune -U UUID /dev/partition; For xfs it will be sudo xfs_admin -U UUID Hi This party my boot partiton “/sda4/grub2/grub. UUIDs are designed to be globally unique. I just found out that you can just use auto-complete (pressing tab twice) on commands like grub-reboot or grub-set-default and it'll give you a list of the available boot GRUB_DEFAULT. The root uuids are very important, make sure you typed them correctly. 1 minute read First make sure you have secure boot disabled from the firmware settings. 4 ns) /0/3a/1 memory 16GiB DIMM DDR4 Synchronous 2666 MHz (0. How to run sudo blkid from a live DVD: Boot from Ubuntu live disk, click on Try Ubuntu option on startup. conf files. Drivers numbers are BIOS/UEFI/hardware dependent and "unstable", partition If you used ext for it: tune2fs /dev/{device} -U {uuid} From man tune2fs-U UUID. 06-13+pmx1 Minimal BASH-like line editing is supported. Never should have altered the UUID of the cloned H/W path Device Class Description ===== system B360 HD3P-LM (Default string) /0 bus B360HD3PLM-CF /0/0 memory 64KiB BIOS /0/3a memory 64GiB System Memory /0/3a/0 memory 16GiB DIMM DDR4 Synchronous 2666 MHz (0. Java Edition; 1. 4. Follow edited Mar 8, 2023 at 12:36. This is usually more reliable, but in some cases it may not be appropriate. Improve this answer. 1 server and I wanted to update the kernel in order to keep the RAID after a reboot (I had to do that with Proxmox 5. Lifka Lifka. Given the Grub menu (as described in /boot/grub/grub. On /etc/fstab (on the new partition), I also changed all the UUID's of the old partitions to the new ones. cfg will contain one UUID used in the process of Via UUIDs. e. The GRUB configuration file is an excellent source of information for obtaining the UUID of the drives. 17. Story: Use blkid to find out the original partitions UUIDs. 5k 4 4 gold badges 84 84 silver badges 122 122 bronze badges. Es gibt einige Methoden, um im Grub-Menü die Namen der Derivate richtig anzuzeigen. The first section tells grub how to find the /boot partition containing the Linux Kernel (and initramfs): if [ check if the UUID displayed matches with the UUID in your root partition's /etc/fstab; generate a new UUID using uuidgen and apply it to the partition using tune2fs -U ; Run the following command to open the grub. These sticks will not boot because the UUIDs in GRUB have not changed, and I'm fairly baffled by the way GRUB records them, You can always list all the drives in GRUB using the ls command. d. cfg became: probe -u $root --set=rootuuid set imgdevpath="/dev/disk/by-uuid/$rootuuid" There is special option GRUB_DISABLE_LINUX_UUID=true in /etc/default/grub file. It turns out that the root partition's UUID is stored in two places in the grub2 portion of the modern Fedora Server's /boot partition. hd8,gpt5 is just a hint for GRUB, which is used when uuid is found more than once (multiple partitions with the same UUID). Follow edited Jul 6, UUIDs can be determined using the blkid command. It will also Note that for each partition, there are two UUIDs shown by this tool; you want the first of these. As part of the hotplug system, udev is executed if a device is added to or removed from the system. I have had no success with yaird and root=UUID yaird just seems to translate it to /dev/sdX. Past that, you could definitely double-check the values in /boot/grub/grub. Re: Grub issue after Timeshift restore. cfg files. Add it, then run update-grub and you will have config with kernel device names. 🍥 My approach OpenShift, Kubernetes, Docker and more. Add a comment | 3 lsblk with various options can show you what disk/partition/uuid are in use. grub> When I run grub-mkconfig on Debian 10, What is being done in this piece of the program and why does it use different UUIDs? And where are these UUIDS taken from? debian; grub; Share. I'm writing a custom grub. Note also that non-privileged users cannot run blkid. However the real problem here is the path I used was wrong. The UUID parameter may also be one of the following: What is a menu item identifier? I seem to have stumbled onto the right answer to the question above. ~ Sent from a Fedora 22 box 17. Database engines can readily index, sort, and filter a list of numbers that's only going in one direction. This is an additional security measure to be used along with a BIOS/UEFI password (e. The file system that has the UUID I got from GRUB Shell is on my external hard drive. Next: source, Previous: sleep, Up: Command-line commands . --version. ) and some more that I don't care. Update /etc/default/grub file by adding the line:. --part-uuid is currently only implemented Run sudo blkid from the terminal (from a live DVD if needed) and check the UUID's against what /etc/fstab has. If I take out the USB as it’s restarting, it boots into Windows. answered Dec 5, 2013 at 14:34. One of it is the use of grub2 instead of grub. After all the UUID could be anywhere. cfg should reveal the UUID. Briefly, the bootloader is the first software program that runs when a computer starts. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online The following packages will be REMOVED: grub-pc The following NEW packages will be installed: grub-efi-amd64 0 upgraded, 1 newly installed, 1 to remove and 22 not upgraded. Maybe I chose the wrong filesystem type. You should correct that problem, as what you're asking about is hardware specific (inc. And followed by a sudo update-grub and a sudo update-initramfs . - GRUB refuses to detect Windows mount /dev/sdax /mnt grub-install /dev/sda --boot-directory=/mnt grub-mkconfig -o /mnt/grub/grub. Then I changed the custom grub menuentry to something I hope that I will not need to touch again. cfg and reboot the system. The reformatting of the root partition ("/") actually changed the UUID. 0 build 1: Added /list. The root partition can also be identified using the file system's UUID (universally unique identifier) as follows: root=UUID=134d2a24-2699-4b0c-823b-1e13633f3b07. You can use UUIDs instead of the traditional (hdx,y) method with this command: search --no-floppy --fs Search devices by file (-f, --file), filesystem label (-l, --label), or filesystem UUID (-u, --fs-uuid). os_prober_skip_list: - ' 65168eab-b6ef-4bd0-8da0-c00acaa8e37d ' - ' 5df7e569-230b-4579-bd26-358c2bc60cad ' # Normally, grub-mkconfig will generate top level Menu pve-efiboot-uuids found, skipping ESP sync pve-efiboot-uuids found, skipping ESP sync. 12: smbios. How do I configure grub to be using the kernel names instead of the UUID so that the image can be truly ported to the other systems? I have tried setting GRUB_DISABLE_LINUX_UUID=true in /etc/default/grub and then run grub2-mkconfig -o Ubuntu has been using UUIDs in Grub instead of the traditional /dev/* setup for a few versions now. I need to edit /EFI/ubuntu/grub. Because without GRUB avoids this problem nowadays by using UUIDs or file system labels when generating grub. Run the following command to query all types of Disabling os-prober wasn't correct solution in my case - I had 2 Windows entries and just wanted to remove one incorrect. It is randomly generated with system hardware information and time stamps as part of its seed. The delete/create generated new UUIDs, which broke grub. 0-29-generic from my laptop's /boot folder into USB drive's boot folder. - GRUB refuses to detect Windows Make sure that your Grub configuration doesn't hard-code disks like (hd0), but instead searches for the boot and root filesystems' UUIDs. I’m pretty sure that after a while the new OS creates the symbolic links. It finishes, then tells me to restart. thanks to You can directly change the UUID in /boot/grub/grub. But in the event mount types are not by UUID in /etc/fstab what is a reliable way of deducing the UUID of the boot partition on linux [any - genfstab /mnt >> /mnt/etc/fstab generates wrong UUIDs and I have to restart and implement the solution in the link provided. device is the device file of the decrypted (swap) filesystem used for suspend to disk. Sep 17, 2019 For more on using UUIDs, see this article (from Ubuntu help, but it should work for any Linux distribution using UUIDs). img-3. If swap is on a separate partition, it will be in the form of /dev/mapper/swap. cfg automatically. Its just a UUIDs. cfg file (copied to the mirror disk) with its first line instructing grub to look for the uuid of the failed system disk. cfg for a drive that can be used in different computers. 1' --class opensuse --class gnu-linux --class LVM UUIDs. Control GRUB's Menu Timeout: If GRUB isn't automatically hidden, you'll see the menu each time your computer boots. I have a number of devices listed in blkid: /dev/sr0 /dev/loop0 /dev/sdb /dev/sda /dev/zram0. I had this (notice the blue hard coding it to Somehow and I don't know how the filesystem UUIDs on both disks are the same and also all thru both grub. 1. Normally, grub-mkconfig will generate menu entries that use universally-unique identifiers (UUIDs) to identify the root filesystem to the Linux kernel, using a ‘root=UUID=’ kernel By default grub-mkconfig determines the UUID of the root filesystem for the configuration. It will set it as the root. cfg or the /etc/fstab on the root filesystem, but is that the only way? I use bash 'ls -l' all the time so I knew it did not list UUID's, but in the grub shell, it does! Arch - LVM - ext4 - gnome (T60p 14. All you need to do is replace the UUIDs in the sample with the correct UUIDs for your system. 16. menuentry 'Ubuntu 14. Improve this question. cfg to make grub. It's a lot more common to use UUIDs. ) The other well known real life situation where UUIDs come handy is at booting to identify the device which you want to boot in GRUB. That's how grub-mkconfig works: it automatically creates GRUB menu entries for every kernel it discovers. efi in the same directory on the EFI System Partition (which on your system is nvme0n1p1). At least in Vista, the menu name is the same as the normal Vista operating partition, the # If you like the idea of using UUIDs to avoid unreliable BIOS mappings or are struggling with GRUB's syntax, here is an example boot menu item that uses UUIDs and a small script to direct GRUB to the proper disk partitions for your system. 1 1400p x86_64), (T60 15 flexview 1400p i686) In the event you are using efi and not bios boot mode, the commands are just slightly different. 1 pre1: Added /list uuids. Re: When I boot my computer I get this: error: no such device: 6ae62c89-5573-4c83-b4b8-9aa3722bd1f8. Next we fix grub with: grub-mkconfig; update-grub; Then run: update-initramfs -u /boot/initrd. Is there Skip to main content. Using this for security is a horrible idea. For example, a social media platform might use UUIDs to identify individual user profiles, posts, and comments. GRUB supports PC BIOS, PC EFI, IEEE 1275 (Open Firmware), SPARC, and MIPS Lemote Yeeloong. If that file is wrong you'll have trouble with (hdX) This permits a custom grub menu without having to mess with it. Adding "iommu=on" through grub's editor works, but I'd have to manually do that after each reboot. cfg and it looks identical and the UUIDs are still correct. It first reads a mini-grub. This command lists UUIDs for all attached devices (mounted or not). cfg so that will not use UUIDs. After I ran update-grub, the two entries were successfully added to the GRUB menu, and now, the “Generic UUID” entry boots fine. Note that for knetbsd the image must grub-mkconfig will determine the correct UUID of the decrypted root filesystem and add it to grub. Commented Jan 28, 2020 at 22:10. YOURVERSION-HERE Run blkid disk. Typically grub. ) jeweils nicht die Namen der Derivate an, sondern stattdessen immer „Ubuntu“. If the ( -s , --set ) option is used, the first device found is set as the value of environment variable use $abc as uuid variable of $root. eg % sudo lsblk -o UUID,PARTUUID,NAME,MOUNTPOINT The only difference with the original entries are the menuentry titles, and the “root=UUID” notation on the ‘linux’ lines. nick_0189 Member Registered: 2020-12-21 Posts: 45. – rosch. x) To begin, I created the RAID : mdadm --create /dev/md3 --metadata=0. I installed GRUB on it, and I copied two files, vmlinuz-3. But the problem is whenever I insert usb pen drive, the above configuration doesn't work. GRUB will automatically bot the default operating system after a period of time, usually ten Wanting to delete the Windows 10 menu entry from Grub menu I thought about adding the parameter "GRUB_OS_PROBER_SKIP_LIST" in the /etc/default/grub file. Anyone with a Super GRUB2 disk will be able to On the /boot/grub. Software Requirements and Linux Nothing helped but at least i got some information. GRUB, or more formally GRUB 2, replaces the original "GRUB Legacy" (or "GRUB 1") with an entirely separate code base The BIOS used the drive numbers, UEFI can use the numbers (not sure if it can use UUID, too) and grub etc. H/W path Device Class Description ===== system B360 HD3P-LM (Default string) /0 bus B360HD3PLM-CF /0/0 memory 64KiB BIOS /0/3a memory 64GiB System Memory /0/3a/0 memory 16GiB DIMM DDR4 Synchronous 2666 MHz (0. ) It seems the offending code is in grub-mkconfig_lib lines 169-182 in current Debian 9. Maybe grub encoded the location of that partition incorrectly in the MBR/post-MBR gap. The point of the bug is that the setup and boot insists on setting up and using the UUID for one part of the boot process despite not being told to by the sysadmin/configuration. How do I configure GRUB to only generate a grub. . These changes allowed me to boot correctly on the new SSD, but after every update, the Hi All, I did receive the message in the topic today after applying the latest updates when running proxmox-boot-tool status Re-executing I installed grub-efi-amd64 on a test machine made some changes in /etc/defaults/grub. Open the terminal (Ctrl+Alt+T) and then run sudo blkid command in it. 90 --level=1 --assume-clean - The grub2-mkconfig command creates a new configuration based on the currently running system. Das Grub-Auswahlmenü zeigt bei Multiboot (mit mehreren Ubuntu-Derivaten wie Xubuntu, Lubuntu, Kubuntu, Gnome, Mate etc. haziz haziz. If you still get UUIDs in your grub. ,uuidgen /dev/sdb) you then encounter a device. Its value can be a numeric value, the complete name of a menu entry, or “ saved ”. A list of rules is used to match against specific device attributes. The reason is that changing UUID of NTFS file system to the original one isn't enough for Windows + UEFI, you Stack Exchange Network. Offline #19 2021-04-07 22:35:25. Stack Exchange Network. If there is a PNG file named “myclass. So I reinstalled Debian, backed up an image of the new boot partition and /etc/fstab, then restored from Timeshift again, and this time I replaced the boot partition and fstab with the ones generated by the List of UUID Generator Tools. grub-mkdevicemap fails to rectify the problem These are the UUIDs for two file systems / and /boot. I can't find why, but it throws me this when I try to open Ubuntu: I've already tried to remove the menu. System is started normally without any issues. The data types 06 16, 20, 21 just mean "List Of UUID(s)" (Complete, incomplete, 16, 32, 128 bits). Chrooting into it from my still functional Arch system and doing updates didn't do much. cfg” ### BEGIN /etc/grub. Look in /dev/gptid for the partition's UUID (or gpart list|fgrep uuid). Last Modified: November 29, 2022. I confirmed in the BIOS boot menu that there was no option to UEFI boot to the USB. 2,987 9 9 gold badges 37 37 silver badges 48 48 bronze New clean install of x86 11. To Is it possible to force grub NOT to use uuids. If you needed to, you could copy it to a char * that you manage on your own, but for just passing to printf , that's not needed. Hello, I am setting up a RAID on a new Proxmox 6. If this option is given, then the non-option argument is a system device name (such as ‘/dev/sda1’), and grub-probe will print information GRUB Legacy is a multiboot bootloader previously maintained by the GNU Project. lsblk(8) is also easy to use in scripts. So this indicates that grub is failing to find the partition of either the ntfs or the ext4 partitions despite the fact that the UUIDs are correct. At this point I looked in grub. Best thing to do there is trying to figure out what the filesystem type is and check that against the names of the scripts in The UUID tells you the ID is supposed to be unique given the Unique in its name. The problem was that the root volume would not be assembled, therefore not available for boot and hence I couldn't boot. Set the universally unique identifier (UUID) of the filesystem to UUID. Pocket Edition Alpha; v0. It’s how systems recognize and distinguish between different data elements, users, and devices. cfg file contains the correct UUIDs for the first and second partition; The only link I can't really verify is grub locating the partition containing the configuration file. I checked etc/fstab multiple times to ensure that the UUIDs were the same. Maybe I set the wrong boot flag. uhcafigdc, My answer is if you do not want the hassle of editing the UUID every time go with a distro like Ubuntu that has defaulted to UUID. For a description of this compatibility layer and its known issues, grub-probe must be given a path or device as a non-option argument, and also accepts the following options: --help. Article Type: Technical Reference. Dual boot with windows XP and Linux on separate drives. If the device map file does not exist, then the GRUB utilities will assume a temporary device map on the fly. 3. Then on the next boot we had the old problem back. cfg as After cloning, I booted from my ultrabay hard drive (the clone), changed the UUIDs of all ext3 partitions (all the partitions that I could change) on that drive, and changed all FSTAB and GRUB specifications from labels to UUIDs (where applicable). Entering rescue mode grub rescue> Background: I installed Fedora When it opens, list devices by entering: ll /dev/disk/by-uuid By default, ll is an alias of ls -alF. Means that except the partition with the bootloader, the whole system is i When data is replicated across multiple servers, UUIDs ensure consistency by guaranteeing unique identification. The example With the original disk would it be possible to rebuild the GRUB menu? So I should also have an additional backup tool to protect against hardware and system issues. blkid. img to list them – it'll show filesystem UUIDs as UUID= and partition UUIDs as PARTUUID=. With PARTUUID you only check the partition tables, so it's easier/more performant. Learn where your /boot/grub is located -- most likely it's on your root, so ls /boot/grub is enough to make sure. @Patrick: I don't get what you're trying to say. As far as I’ve looked, partition UUIDs in config files should be fine. The only difference with the original entries are the menuentry titles, and the “root=UUID” notation on the ‘linux’ lines. Upgrading a grub/grub2 Configuration for EFI Hosts to Use UUID Disk Identifiers. To change the default in GRUB, you'd have to edit its configuration files, and I'm afraid I don't recall the details of what you'd need to change. UUID stands for Universally Unique Identifier (sometimes called "GUID" or "Globally Unique Identifiers"). For efi chainloaders it’s <UUID>@<EFI FILE>. cfg corrected so that the sda9 GRUB list UUIDs listed in /etc/fstab for those partitions. 0 or newer) Linux LVM. # GRUB-install --no-floppy /dev/sdb1 # update-GRUB GRUB> find /boot/GRUB/stage1 GRUB> root (hd1,0) # result of above GRUB> setup (hd0) There's definitely a mismatch, because sdb, which has 3 partitions, seems to be (hd2) at the GRUB rescue> prompt, but (hd1) when actually booted. After reading several discussions about it and the Grub manual: "‘GRUB_OS_PROBER_SKIP_LIST’ List of space-separated FS UUIDs of filesystems to be ignored from os-prober output. Another command that can be used to perform the same task is blkid. UUIDs — Universally Unique Identifiers PARTUUID of GPT partition. map. cfg exit umount /mnt reboot On first reboot after installing on my MacBook Pro9,2 I had the exact same problem as Sotanaht, and I'm certain it was because I forgot to execute the grub-mkconfig step during installation. The ${cmdpath} gives me the correct grub. – Tom Yan. Need to get 45 . 3 x 10 36 So I thought that I had to use the Live CD to access the grub config file and make my changes. Problembeschreibung¶. The configuration format is changing with time, and a new configuration file can become slightly incompatible with the Stack Exchange Network. You seem to be applying the assumptions of the LVM of some other unix-like system to the modern (= kernel 2. Problem. Visit Stack Exchange Starting with Linux kernel 2. But from that option --fs-uuid I guess you want the filesystem's UUID? That could be in the output of dumpfs(8) (for UFS) or zfs get guid <poolname/bootfs>. Finally, post its output in Let’s try to redo the steps again, but with some additional steps: Boot into a live USB and chroot (manjaro-chroot) into your Manjaro systemMake sure that within this chroot, /boot/ and /boot/efi/ are both available Re-install Grub to The auth or authconfig Kickstart command is deprecated in Red Hat Enterprise Linux 8 because the authconfig tool and package have been removed. System is a Dell R740XD Intel Xeon Gold based system. But you'd need a ton of block devices for that to make a difference. Follow edited Mar 27, 2023 at 8:47. When I go to fix I am currently trying to dualboot Windows 11 and Fedora 40. The UUID parameter may also be one of the following: The Grub boot loader is most likely to be the other places, as it is the most popular among Linux's. Also, since I lost my root password I wanted to start a single user recovery mode in order to set the password, so to the end of the linux xxx I have added recovery single. So I was sure it had something to do with the grub The BIOS used the drive numbers, UEFI can use the numbers (not sure if it can use UUID, too) and grub etc. Remember that GRUB line also has this GRUB_CMDLINE_LINUX_DEFAULT="quiet splash", and the resume should be added to what's there now. Result [edit | edit source] Always succeeds. On Ubuntu, it is in /sbin, so the above will work. Proxmox Virtual Environment. cfg on the Somehow and I don't know how the filesystem UUIDs on both disks are the same and also all thru both grub. 531 6 6 silver badges 19 19 I found that my labels change less often than the UUIDs, in fact, my labels really never change unless I redo my partitioning scheme. @adamatengaging writes:. Follow answered Apr 16, Hi guys, I’m having trouble locating UUIDs for items and characters. I've had update-grub completely screw up the UUIDs in grub. For Fedora, it appears to need: sudo /lib/udev/vol_id -u /dev/sda2 Share. Run the following command to query all types of Daniel Richter has developed a GUI configuration tool to allow users to change the Grub 2 settings without using the command line. UUID Why in menu GRUB appears a UUID different? How I can change it? arch-linux; system-installation; grub; Share. If GRUB doesn't normally display this menu, you can get it to display by hitting the Shift key (IIRC) as GRUB starts up -- so basically, just keep repeatedly hitting Shift as soon as you turn on the computer. cfg, and sure I want to script a somewhat automated method for editing /etc/default/grub and appending fips=1 boot=UUID=???? to GRUB_CMDLINE_LINUX=. I do see the words GRUB MENU pop up just for a split second. But in the event mount types are not by UUID in /etc/fstab what is a reliable way of deducing the UUID of the boot partition on linux [any This answer uses file -s /dev/sda to see if the GRUB MBR has been successfully installed. I know when I changed this on my OMV6 disk after cloning it to update the clone to OMV7, but I may have restored the OMV6 disk from a backup that had the unchanged UUID. partuuid command. I want to script a somewhat automated method for editing /etc/default/grub and appending fips=1 boot=UUID=???? to GRUB_CMDLINE_LINUX=. Everything would be fine if, only if, GRUB was set up correctly. I discovered that "a priori" the Windows systems needs the WBM and can not be started without (). If I don’t, it boots into GRUB, but only shows the options to boot into the Fedora Live install, to test the media, and troubleshooting. Use blkid or e2label /dev/sda1 to get the partition label then replace it in your fstab, the root option in grub. To disable this, uncomment GRUB_DISABLE_LINUX_UUID=true. cfg location, so I'm basically trying to do set root=${cmdpath}/. map problem within GRUB. The boot menu where GRUB displays the menu entries from the “grub. UUIDs ensure each element is distinct and can be unmistakably referenced across different programs or components. Follow asked Oct 25, 2023 at 18:22. This is often good enough, particularly in the common case of single-disk systems. So how can I get grub. You can use Ubuntu install CD to get the UUID(s) [gparted or command Insbesondere vor der Verwendung der Befehle grub-install und grub-setup sollte man anhand der Auflistung der UUIDs vergleichen, dass der gewählte Datenträger auch tatsächlich die GRUB_DISABLE_LINUX_UUID=true in /etc/default/grub forces GRUB to not use UUIDs. Follow edited Feb 27, 2023 at 15:27. The problem isn't the names per-se. A short story: I never thought I will need to touch PARTUUID of GPT partition, until now, when I try to migrate Windows from a small disk to a large disk, Windows failed to boot on the large disk and it can't even be repaired automatically. So I search a solution to (Booting the "old" Win directly from the "BIOS" (UEFI) works). cfg manually and never use update-grub and have a so called master Grub2 bootloader where i choose from where to boot from, then i let each linux distro to install its own bootloader on its own root partition, so linux can edit its own bootloader without touching my master grub2 bootloader. d look, as if they might not respect that option, I don't really understand the whole script though other than that I found nothing that could be responsible. Article ID: 77906. 6, udev provides a user space solution for the dynamic /dev directory, with persistent device naming. That's more or less cosmetic. It is a list of items, where each item has a title and an optional icon. In UUID version-4, which is completely random, there are approximately 5. For the first word, TAB lists possible command completions. Further on: # Edit the grub config nano /etc/default/grub Make sure it contains: GRUB_PRELOAD_MODULES="part_gpt raid mdraid09 ext2" The Fedora 15 grub. Pablo Bianchi. Proxmox VE: Installation and configuration . I followed the guidelines from this post (on the 6 section) . cfg I added "list_trusted", because I wanted to see if the key is stored correctly. You may need to look for the efi partition with the kernels in addition to the root lvm partition. $ sudo - genfstab /mnt >> /mnt/etc/fstab generates wrong UUIDs and I have to restart and implement the solution in the link provided. 4 ns) /0/3a/2 memory 16GiB DIMM DDR4 Synchronous 2666 MHz I normally write grub. By default, boot the 1st partition listed below. That said, in modern web Of course not every member has an own UUID, we don't have one and you usually don't need it. So I want to the 1st uuid is of sda9, but the 2nd uuid there is of sda5. I’ve had success in the past of using altered cheat engine commands to spawn in lost/broken NPCs, but I’ve never been able to figure out exactly how to locate the UUIDs in the game files, I’ve lucked out and If this option is set to ‘true’, disable the generation of recovery mode menu entries. Even after GRUB has been updated with the new UUIDs, it is possible that the wrong version of Ubuntu will be started by default, but answers are provided in How to change the order on my dual booting distros. 65 search Command: search [--file|--label|--fs-uuid] [--set [var]] [--no-floppy|--efidisk-only] name Search devices by file (-f, --file), filesystem label (-l There is a way to indicate to grub to install on a device MBR by UUID instead of using /dev/sdX ? I'm setting a external eSATA hard disk with NixOS, and obviusly, the hard disk not would be always Skip to main content. Or post both results into your question please. d/10_linux ### menuentry 'openSUSE Leap 42. resume resume=device. The UUID is actually the UUID of the ext2/3 filesystem, which you can see if you use dumpe2fs /dev/sda | grep UUID. BTW. K. A Universally Unique Identifier (UUID) is nothing but an identifier standard used in software construction, standardized by the Open Software Foundation (OSF) as part of the Most likely you'll find UUIDs instead of /dev/sd* device names. cfg as you did. cfg file: vi /boot/grub2/grub. It collects information from the /boot partition (or directory), from the /etc/default/grub file, and the customizable scripts in /etc/grub. Visit Stack Exchange The relevant menu entry in my grub. I have replaced one failed disk in my ZFS pool. I was able to achieve desired effect using following Grub configuration: 1. Artur Meinild. When I boot the system, I hold down the shift key. I'm not aware of support in Grub to declare two disks as being in a RAID-1 array so that grub-install would automatically write to both. 417 1 1 gold badge 4 4 silver badges 15 15 bronze badges. cfg is not updated automatically. Only when regenerating my grub config was I able to boot into the system ONCE. I tried to create a symlink to /dev/sda1 at /dev/disk/by-uuid/<<uuid that is there>>, just like the other UUIDs that were Set this option to 'true' to # disable this. For ext2/ext3/ext4 partitions use sudo tune2fs -U UUID /dev/partition to set the UUID which you got in 1. Make sure that your Grub configuration doesn't hard-code disks like (hd0), but instead searches for the boot and root filesystems' UUIDs. If option --set is given, assign result to variable var, otherwise print information on the screen. Commented Aug 26, 2017 at 8:30. You can always list all the drives in GRUB using the ls command. It does not With CentOS/RHEL 7 there are a couple of changes (compared to CO/RHEL 6). cfg, and sure The benefits of UUIDs are quite compelling. cfg, and we advise that you do the same for any custom menu entries you write. Re: Disabling os-prober wasn't correct solution in my case - I had 2 Windows entries and just wanted to remove one incorrect. Never should have altered the UUID of the cloned To prevent GRUB from being automatically hidden, comment the line out-- just add a # before it so that it reads #GRUB_HIDDEN_TIMEOUT=0. Fix these entries as they're important. So step 1 is to make sure /boot/grub/grub. : a zpool(8) also has an UUID. Das kann für manche Benutzer irritierend sein. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. cfg completely free of UUID references and only use labels? First boot using a rescue system (same version) and run a shell on your non-booting disk. , to protect corporate computers from unprivileged users trying to leverage their physical access to boot UUIDs take up 128 bits in memory and can take up more if stored as a string. As noted in comments to this question, vol_id may not be in your path. 04 Trusty Tahr (on sda5)' --class ubuntu --class gnu-linux - By default, boot the 1st partition listed below. 2. Variable If false, ${GRUB_DEVICE_UUID} is passed in the root parameter on the kernel command line when an initramfs is available. conf it looks like one of the scripts is not checking against the GRUB_DISABLE_LINUX_UUID setting. S. And for jumping to other disk MBR i have this kind of Recovering the UUID of a drive in Linux from the GRUB configuration file. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted I have been extra careful with UUIDs, which led me to notice something strange: The UUID generated inside chroot by the above commands in /boot/efi/debian. giczn ios bofuh dyihn etgu xbwouke ykvo hepd hhimhs krh