[Bug 2119155] Re: grub-pc cannot install on software raid1

[Mate Kukri]

Hmm okay in that case this is duplicate of
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2060695 and that
bug should be re-opened as still not fixed.

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Title:
  grub-pc cannot install on software raid1

Status in grub2 package in Ubuntu:
  New

Bug description:
  I'm upgrading Ubuntu 22.04 to 24.04 and suddenly grub-pc fails after
  running grub-install. I tried reisntalling it to find more details and
  here's the output I've got:

  # apt reinstall grub-pc
  Reading package lists... Done
  Building dependency tree... Done
  Reading state information... Done
  0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
  Need to get 137 kB of archives.
  After this operation, 0 B of additional disk space will be used.
  Get:1 http://mirror.yandex.ru/ubuntu noble-updates/main amd64 grub-pc amd64 2.12-1ubuntu7.3 [137 kB]
  Fetched 137 kB in 0s (1252 kB/s)
  Preconfiguring packages ...
  (Reading database ... 236663 files and directories currently installed.)
  Preparing to unpack .../grub-pc_2.12-1ubuntu7.3_amd64.deb ...
  Unpacking grub-pc (2.12-1ubuntu7.3) over (2.12-1ubuntu7.3) ...
  Setting up grub-pc (2.12-1ubuntu7.3) ...
  grub-pc: Running grub-install ...
  Installing for i386-pc platform.
  grub-install: warning: File system `ext2' doesn't support embedding.
  grub-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
  grub-install: error: diskfilter writes are not supported.
    grub-install failure for /dev/md127
  Sourcing file `/etc/default/grub'
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-6.8.0-71-generic
  Found initrd image: /boot/initrd.img-6.8.0-71-generic
  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
  Processing triggers for man-db (2.12.0-4build2) ...

  Please note that Ubuntu 20.04 and 22.04 had no issues with this
  software raid, and I've successfully upgraded 20.04 to 22.04 few hours
  ago.

  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2060695 seems to
  be about the same issue, but it says the fix was released, while
  crearly it's not fixed yet.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: grub-pc 2.12-1ubuntu7.3
  ProcVersionSignature: Ubuntu 5.15.0-151.161-generic 5.15.184
  Uname: Linux 5.15.0-151-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.28.1-0ubuntu3.8
  Architecture: amd64
  CasperMD5CheckMismatches: ./boot/grub/efi.img
  CasperMD5CheckResult: fail
  Date: Thu Jul 31 05:45:49 2025
  InstallationDate: Installed on 2021-01-21 (1651 days ago)
  InstallationMedia: Ubuntu-Server 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: grub2
  UpgradeStatus: Upgraded to noble on 2025-07-30 (0 days ago)

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