[Bug 2040187] Re: do-release-upgrade from 23.04 to 23.10 leaves system unbootable

[Thomas Schweikle]

Same for the now official upgrade. Regardless updating from commandline
(do-release-upgrade) or via graphical application (update-manager).
After having finished upgrading the system will boot into UEFI-Menu, not
finding grub to boot.

The upgrade works, if the system is installed on ext4 with lvm. After
upgrading the system will boot into Ubuntu 23.10.

The upgrade does not work, if the system is installed on zfs with root
on zfs. After upgrading the system will boot into UEFI-Menu without any
chance to ever start Ubuntu 23.10 -- grub is missing.

The upgrade does work partly, if the system uses an ext4 partition for
boot, having /root on zfs. The system will boot into maintenance mode,
unable to mount zfs-root. Looks like the modules for zfs are missing
from the kernel.

The upgrade does work, even with zfs only systems if it is done from a
booted life system.

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https://bugs.launchpad.net/bugs/2040187

Title:
  do-release-upgrade from 23.04 to 23.10 leaves system unbootable

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Install Ubuntu 23.04, then upgrade to the latest packages:

  0. Select UEFI-Boot, deselect Secure-Boot in BIOS
  1. Install Ubuntu 23.04 from ISO to root on zfs
  2. apt update
  3. apt upgrade
  4. apt dist-upgrade
  5. apt full-upgrade
  6. apt autoremove
  7. apt autoclean
  8. reboot

  9. install ubuntu-release-upgrader-core if it is not installed
  10. remove all snapshots: zfs list -r -o name -t snapshot | xargs -n1 zfs destroy
  11. do-release-upgrade --devel-release --allow-third-party
  12. Wait ubuntu installing over 1400 packages, removing about 140 packages, doing some cleanup
  13. reboot
  14. Watch Ubuntu booting into UEFI menu
  15. Have some analysis done.

  Grub is missing from the just upgraded system.

  ProblemType: Bug
  DistroRelease: Ubuntu 23.04
  Package: ubuntu-release-upgrader-core 1:23.04.7
  ProcVersionSignature: Ubuntu 6.2.0-35.35-generic 6.2.16
  Uname: Linux 6.2.0-35-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.26.1-0ubuntu2.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  Date: Mon Oct 23 21:57:15 2023
  InstallationDate: Installed on 2021-01-19 (1006 days ago)
  InstallationMedia: Xubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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