URL:
<https://savannah.gnu.org/bugs/?63030>
Summary: Different partition grub entries get identical
root=UUID=sameuuid
Project: GNU GRUB
Submitter: reikred
Submitted: Thu 08 Sep 2022 02:03:44 AM UTC
Category: Configuration
Severity: Major
Priority: 5 - Normal
Item Group: Software Error
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Release: other
Release:
Discussion Lock: Any
Reproducibility: None
Planned Release: None
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Follow-up Comments:
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Date: Thu 08 Sep 2022 02:03:44 AM UTC By: Reik Red <reikred>
I have 3 versions of Ubuntu (20,21,22) installed on my machine, but when I
select to boot 20 or 21 it still boots 22! The reason turns out to be that ALL
the entries in grub.cfg have the same UUID specified:
linux .... root=UUID=....ddde
But the ....ddde partition is the one that contains Ubuntu 22.04. The grub
menu shows an entry as Ubuntu 21.04 (or 20.04.3), but grub still boots Ubuntu
22.04 from that entry because the wrong UUID is being used.
Running update-grub and/or grub-mkconfig is what produces the errant grub.cfg
file. And I don't understand why this is happening.
grub-mkconfig is reporting sensible findings, such as
Found Ubuntu 20.04.3 LTS (20.04) on /dev/sda3
Found Ubuntu 21.04 (21.04) on /dev/sda4
(this is of course grub2, which is called just grub for several years now)
Added: output of sudo blkid /dev/sda*. It seems normal, the UUID are all
different.
sudo blkid /dev/sda*
/dev/sda: PTUUID="5adeb302-3e17-421e-aabc-41bb2377a86f" PTTYPE="gpt"
/dev/sda1: LABEL_FATBOOT="EASY2BOOT" LABEL="EASY2BOOT" UUID="3C18-9DDC"
BLOCK_SIZE="512" TYPE="vfat" PARTLABEL="Microsoft basic data"
PARTUUID="2d2d85db-6382-43f5-9166-1d31da742e06"
/dev/sda2: LABEL="X.SSD./root-ub22"
UUID="8d66f7b3-dc29-40b1-b0f0-06105da0ddde" BLOCK_SIZE="4096" TYPE="ext4"
PTTYPE="dos" PARTLABEL="Linux filesystem"
PARTUUID="c5a10849-2f94-4917-9e56-cc5e594da0ee"
/dev/sda3: LABEL="X.SSD./root-ub21"
UUID="d92b1ba1-ede6-4ba4-8f43-cfd7b89d4157" BLOCK_SIZE="4096" TYPE="ext4"
PTTYPE="dos" PARTLABEL="Linux filesystem"
PARTUUID="27fdc527-1e9b-4b77-a49e-dd92299b2ec7"
/dev/sda4: LABEL="X.SSD./root-ub20"
UUID="4cc88374-3255-475b-be75-59ab2c462934" BLOCK_SIZE="4096" TYPE="ext4"
PTTYPE="dos" PARTUUID="a2aeaf9e-4ecc-473e-8c8e-e82e16dc7846"
/dev/sda5: UUID="1D3E-50B4" BLOCK_SIZE="512" TYPE="vfat" PARTLABEL="EFI system
partition" PARTUUID="4cc2c6b3-9678-4819-a18a-139ceecebb94"
This bug might be easier to debug if grub-mkconfig had a verbose mode that
would report how the UUID was determined, and/or an option to generate a menu
item for just a list of partitions, say something like
grub-mkconfig -o grub.cfg.debug /dev/sda2 /dev/sda3
Version: grub-2.06
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