Re: os-prober issue. Not find all distributions on multi boot SSD

[Matej Marko <ekonom1@atlas.sk>]

 

Hello Pascal

Thank you very much for help with commands.

Yes, you have true. If is my interpretation of outputs of commands correct, main of Ubuntu based distribution use subvolumes. Only Ubuntu Desktop not use subvolumes. Only Ubuntu Desktop finds os-prober correct.

It is very valuable information for developers, how to repair this bug.

More information on screenshots on this link

https://imgur.com/a/tJ0MDzU

 

Other my tests:

I installed more distributions on the same SSD on ext4 on the same PC. All work correct. On every last installed distribution are automatically displayed previous installed distributions in GRUB. On BTRFS no.

Source of issue are BTRFS subvolumes.

 

 

 

______________________________________________________________
> Od: "Pascal Hambourg" <pascal@plouf.fr.eu.org>
> Komu: "Matej Marko" <ekonom1@atlas.sk>
> Dátum: 15.02.2025 13:09
> Predmet: Re: os-prober issue. Not find all distributions on multi boot SSD
>

> CC: <debian-boot@lists.debian.org>

On 15/02/2025 at 10:09, Matej Marko wrote:
 > No, I am not used subvolumes. It is not subvolumes, I think. I created 
 > very simple partitions in distribution installer.
 
 Be aware that some distribution installers may implicitly create 
 subvolumes. For example the Debian installer creates a subvolume 
 "@rootfs" for the root filesystem, but Debian's os-prober looks only 
 into the top-level subvolume (or the first mounted subvolume) when 
 probing GNU/Linux systems.
 
 You can check subvolumes in an unmounted btrfs filesystem with:
 
 # mount /dev/sda2 /mnt
 # btrfs subvolume list /mnt
 # btrfs subvolume get-default /mnt
 # umount /mnt