[Bug 2083506] [NEW] Updating grub will break booting is root is on zfs

[Thomas Schweikle]

Public bug reported:

Upgrading grub from 2.06 to any later version may break grub if the filesystem to boot from is not one of ext2,3,4.
Upgrading grub from 2.06 to any later version will break grub if root is installed on zfs.
The system remains unbootable. No fix seems to work (reinstalling Grub, etc.)

This is even for a new install if zfs on root was selected!
The system will install, but it will not boot right after install.

The only way to fix this is: install Ubuntu 24.04, then remove grub
2.12, install grub 2.06 and tools. Afterwards grub will work an the
system will boot -- regardless of filesystems used for root and boot
volumes.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: grub-common 2.12-1ubuntu7
ProcVersionSignature: Ubuntu 6.8.0-45.45-generic 6.8.12
Uname: Linux 6.8.0-45-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Wed Oct  2 15:05:00 2024
InstallationDate: Installed on 2011-10-19 (4732 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: grub2
UpgradeStatus: Upgraded to noble on 2019-04-27 (1985 days ago)

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


** Tags: amd64 apport-bug noble

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https://bugs.launchpad.net/bugs/2083506

Title:
  Updating grub will break booting is root is on zfs

Status in grub2 package in Ubuntu:
  New

Bug description:
  Upgrading grub from 2.06 to any later version may break grub if the filesystem to boot from is not one of ext2,3,4.
  Upgrading grub from 2.06 to any later version will break grub if root is installed on zfs.
  The system remains unbootable. No fix seems to work (reinstalling Grub, etc.)

  This is even for a new install if zfs on root was selected!
  The system will install, but it will not boot right after install.

  The only way to fix this is: install Ubuntu 24.04, then remove grub
  2.12, install grub 2.06 and tools. Afterwards grub will work an the
  system will boot -- regardless of filesystems used for root and boot
  volumes.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: grub-common 2.12-1ubuntu7
  ProcVersionSignature: Ubuntu 6.8.0-45.45-generic 6.8.12
  Uname: Linux 6.8.0-45-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: XFCE
  Date: Wed Oct  2 15:05:00 2024
  InstallationDate: Installed on 2011-10-19 (4732 days ago)
  InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  SourcePackage: grub2
  UpgradeStatus: Upgraded to noble on 2019-04-27 (1985 days ago)

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