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

[Mate Kukri]

Try
> echo "set grub-pc/cloud_style_installation false" | sudo debconf-communicate

Then do
> sudo dpkg-reconfigure grub-pc
And select /dev/sda and /dev/sdb when asked for disks.

That should fix this issue, but the question is, did this installation
come from a cloud image? Or what media was used to install this? That
first value should only be set on cloud images.

Or if this doesnt fix it, it might be the subiquity, cloud-init issue
you've linked, but I believe that was fixed.

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https://bugs.launchpad.net/bugs/2119155

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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