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boot: error: compression algorithm 98 not supported

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Dave G

My Ubuntu 21.04 workstation seems to be having a problem after the latest update. Upon rebooting I see "error: compression algorithm 98 not supported" prior to the GRUB boot menu being displayed.

When I installed Ubuntu 20.04 on this system (now upgraded to 21.04) I followed the 'Root on ZFS' instructions listed here: https://openzfs.github.io/openzfs-docs/Getting%20Started/Ubuntu/Ubuntu%2020.04%20Root%20on%20ZFS.html

Following these instructions, I created a two-device mirror, both formatted with identical partitions configured as:

  1. BIOS Boot
  2. EFI System
  3. Linux RAID (swap)
  4. Solaris Boot (bpool)
  5. Solaris Root (rpool)

I suspect the problem is that partitions 1 & 2 are not being updated properly by update-grub. About a year ago on a different system (20.04) following the instructions listed in Root on ZFS, Step 5: GRUB Installation resolved the issue. But performing these steps doesn't help now, the same error is generated on boot. I can update the BIOS partitions using grub-install on both disks, but there is no equivalent to update both EFI partitions.

I think I need to run grub-install --target=x86_64-efi --efi-directory=/boot/efi \ --bootloader-id=ubuntu --recheck --no-floppy but don't understand the command syntax well enough to fix the problem and I can't experiement on this system, it's got important data on it that I don't want to unnecessarily put at risk.

Can someone please help?

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Dave G
Sadly it appears that the Ask Ubuntu forum is about as useful as the Microsoft Support forums. I.e. it's highly unlikely you'll get anything useful from it, therefore it's not worth the time / effort to even ask the question. Even a place like Reddit is probably a better place to get support.
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