[Bug 2111303] [NEW] Grub does not detect new kernel

Nicolas Henneaux 2111303 at bugs.launchpad.net
Tue May 20 03:46:19 UTC 2025 

Public bug reported:

I run Ubuntu 24.04.02 on kernel 6.11.0-17 with zfs file system. It seems
grub does not detect properly the latest kernel installed and still list
old kernel not installed.

Grub still detects 6.11.0-17 and 6.8.0-52 while 6.11.0-17 and 6.11.0-26
are installed. I would expect the latter to be detected and added in
grub menu.

Installed kernels
$ apt list --installed | grep linux-image
linux-image-6.11.0-17-generic/noble-updates,now 6.11.0-17.17~24.04.2 amd64 [installed,automatic]
linux-image-6.11.0-25-generic/noble-updates,noble-security,now 6.11.0-25.25~24.04.1 amd64 [installed,auto-removable]
linux-image-6.11.0-26-generic/noble-updates,noble-security,now 6.11.0-26.26~24.04.1 amd64 [installed,automatic]
linux-image-generic-hwe-24.04/noble-updates,noble-security,now 6.11.0-26.26~24.04.1 amd64 [installed,automatic]

Detected kernel by update-grub

$ sudo update-grub
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
grub-probe: error: unknown filesystem.
Found linux image: vmlinuz-6.11.0-17-generic in rpool/ROOT/ubuntu_ak8znu
Found initrd image: initrd.img-6.11.0-17-generic in rpool/ROOT/ubuntu_ak8znu
Found linux image: vmlinuz-6.8.0-52-generic in rpool/ROOT/ubuntu_ak8znu
Found initrd image: initrd.img-6.8.0-52-generic in rpool/ROOT/ubuntu_ak8znu
/usr/sbin/grub-probe: error: unknown filesystem.
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done

/boot folder

$ ll /boot
total 274685
drwxr-xr-x  4 root root       17 May 20 05:39 ./
drwxr-xr-x 22 root root       27 Apr  2 14:01 ../
-rw-------  1 root root  9443768 Apr 15 14:48 System.map-6.11.0-25-generic
-rw-------  1 root root  9447409 Apr 17 17:16 System.map-6.11.0-26-generic
-rw-r--r--  1 root root   292033 Apr 15 14:48 config-6.11.0-25-generic
-rw-r--r--  1 root root   292058 Apr 17 17:16 config-6.11.0-26-generic
drwxr-xr-x  2 root root        2 Feb 11 09:49 efi/
drwxr-xr-x  2 root root        5 May 20 05:45 grub/
lrwxrwxrwx  1 root root       28 May 20 05:39 initrd.img -> initrd.img-6.11.0-26-generic
-rw-r--r--  1 root root 81530754 May  5 12:37 initrd.img-6.11.0-17-generic
-rw-r--r--  1 root root 81523888 May  7 06:00 initrd.img-6.11.0-25-generic
-rw-r--r--  1 root root 81536047 May 20 05:39 initrd.img-6.11.0-26-generic
lrwxrwxrwx  1 root root       28 May  5 21:26 initrd.img.old -> initrd.img-6.11.0-25-generic
lrwxrwxrwx  1 root root       25 May 20 05:39 vmlinuz -> vmlinuz-6.11.0-26-generic
-rw-------  1 root root 15358344 Apr 15 15:33 vmlinuz-6.11.0-25-generic
-rw-------  1 root root 15362440 Apr 17 19:38 vmlinuz-6.11.0-26-generic
lrwxrwxrwx  1 root root       25 May  5 21:26 vmlinuz.old -> vmlinuz-6.11.0-25-generic

I suspect something related to zfs without being able to figure out
what's the problem.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: grub2 (not installed)
ProcVersionSignature: Ubuntu 6.11.0-17.17~24.04.2-generic 6.11.11
Uname: Linux 6.11.0-17-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia zfs
ApportVersion: 2.28.1-0ubuntu3.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue May 20 05:42:22 2025
InstallationDate: Installed on 2025-01-24 (116 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble wayland-session

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https://bugs.launchpad.net/bugs/2111303

Title:
  Grub does not detect new kernel

Status in grub2 package in Ubuntu:
  New

Bug description:
  I run Ubuntu 24.04.02 on kernel 6.11.0-17 with zfs file system. It
  seems grub does not detect properly the latest kernel installed and
  still list old kernel not installed.

  Grub still detects 6.11.0-17 and 6.8.0-52 while 6.11.0-17 and
  6.11.0-26 are installed. I would expect the latter to be detected and
  added in grub menu.

  Installed kernels
  $ apt list --installed | grep linux-image
  linux-image-6.11.0-17-generic/noble-updates,now 6.11.0-17.17~24.04.2 amd64 [installed,automatic]
  linux-image-6.11.0-25-generic/noble-updates,noble-security,now 6.11.0-25.25~24.04.1 amd64 [installed,auto-removable]
  linux-image-6.11.0-26-generic/noble-updates,noble-security,now 6.11.0-26.26~24.04.1 amd64 [installed,automatic]
  linux-image-generic-hwe-24.04/noble-updates,noble-security,now 6.11.0-26.26~24.04.1 amd64 [installed,automatic]

  Detected kernel by update-grub

  $ sudo update-grub
  Sourcing file `/etc/default/grub'
  Generating grub configuration file ...
  grub-probe: error: unknown filesystem.
  Found linux image: vmlinuz-6.11.0-17-generic in rpool/ROOT/ubuntu_ak8znu
  Found initrd image: initrd.img-6.11.0-17-generic in rpool/ROOT/ubuntu_ak8znu
  Found linux image: vmlinuz-6.8.0-52-generic in rpool/ROOT/ubuntu_ak8znu
  Found initrd image: initrd.img-6.8.0-52-generic in rpool/ROOT/ubuntu_ak8znu
  /usr/sbin/grub-probe: error: unknown filesystem.
  Warning: os-prober will not be executed to detect other bootable partitions.
  Systems on them will not be added to the GRUB boot configuration.
  Check GRUB_DISABLE_OS_PROBER documentation entry.
  Adding boot menu entry for UEFI Firmware Settings ...
  done

  /boot folder

  $ ll /boot
  total 274685
  drwxr-xr-x  4 root root       17 May 20 05:39 ./
  drwxr-xr-x 22 root root       27 Apr  2 14:01 ../
  -rw-------  1 root root  9443768 Apr 15 14:48 System.map-6.11.0-25-generic
  -rw-------  1 root root  9447409 Apr 17 17:16 System.map-6.11.0-26-generic
  -rw-r--r--  1 root root   292033 Apr 15 14:48 config-6.11.0-25-generic
  -rw-r--r--  1 root root   292058 Apr 17 17:16 config-6.11.0-26-generic
  drwxr-xr-x  2 root root        2 Feb 11 09:49 efi/
  drwxr-xr-x  2 root root        5 May 20 05:45 grub/
  lrwxrwxrwx  1 root root       28 May 20 05:39 initrd.img -> initrd.img-6.11.0-26-generic
  -rw-r--r--  1 root root 81530754 May  5 12:37 initrd.img-6.11.0-17-generic
  -rw-r--r--  1 root root 81523888 May  7 06:00 initrd.img-6.11.0-25-generic
  -rw-r--r--  1 root root 81536047 May 20 05:39 initrd.img-6.11.0-26-generic
  lrwxrwxrwx  1 root root       28 May  5 21:26 initrd.img.old -> initrd.img-6.11.0-25-generic
  lrwxrwxrwx  1 root root       25 May 20 05:39 vmlinuz -> vmlinuz-6.11.0-26-generic
  -rw-------  1 root root 15358344 Apr 15 15:33 vmlinuz-6.11.0-25-generic
  -rw-------  1 root root 15362440 Apr 17 19:38 vmlinuz-6.11.0-26-generic
  lrwxrwxrwx  1 root root       25 May  5 21:26 vmlinuz.old -> vmlinuz-6.11.0-25-generic

  I suspect something related to zfs without being able to figure out
  what's the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: grub2 (not installed)
  ProcVersionSignature: Ubuntu 6.11.0-17.17~24.04.2-generic 6.11.11
  Uname: Linux 6.11.0-17-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia zfs
  ApportVersion: 2.28.1-0ubuntu3.5
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Tue May 20 05:42:22 2025
  InstallationDate: Installed on 2025-01-24 (116 days ago)
  InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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