Public bug reported:

I dual boot Ubuntu 23.10 from openzfs from nvme (main OS) and from ext4
from HDD (backup OS). In 23.10 everything worked, I could use my
datapools on both systems also rpool, The nvme datapool rpool contains
the ROOT dataset and 2 datasets with my main VMs.

I upgraded the ext4 system to 24.04 (do-release-upgrade -d) and that
worked fine. I have 2 other datapools on the HDD and I can use them
without any issue after (zpool import -f) on the ext4 system.

As soon as I try to import the datapool rpool the problem starts, it
gives the following error message:

"Broadcast message from systemd-journald@Host-sdb5 (Sat 2024-03-09
12:50:47 AST): systemd[1]: Caught <ABRT>, from our own process."

Afterwards it is impossible to use the terminal, it just does not start.
However most other applications still work as normal. It is also
impossible to shut-down the system from the menu.  I have to power off
the system with the power button.

On reboot I get the following error messages;

zfs: module license "CDDL" taints kernel.
Disabling lock debugging due to kernel taint
zfs: module license taints kernel

It seems to load the zfs kernel modules again, why? It is superfluous
and wrong, because they are already loaded from ext4 much earlier.
Afterward the system is completely confused and hangs. (see the annexed
photo)

My nvme system does not boot anymore, because it is missing rpool, but
it nicely advises in initramfs to use "zpool import -f" and that works.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.7
ProcVersionSignature: Ubuntu 6.8.0-11.11-generic 6.8.0-rc4
Uname: Linux 6.8.0-11-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Mar  9 13:12:08 2024
InstallationDate: Installed on 2023-12-21 (80 days ago)
InstallationMedia: Ubuntu 23.10.1 "Mantic Minotaur" - Release amd64 (20231016.1)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to noble on 2024-03-09 (0 days ago)
VarLogDistupgradeXorgFixuplog:
 INFO:root:/usr/bin/do-release-upgrade running
 INFO:root:No xorg.conf, exiting

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade noble wayland-session

** Attachment added: "20240309_120126.jpg"
   
https://bugs.launchpad.net/bugs/2056646/+attachment/5754353/+files/20240309_120126.jpg

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https://bugs.launchpad.net/bugs/2056646

Title:
  Ubuntu dual boot mix up from zfs and from ext4

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