Public bug reported:

During upgrade to 26.04, my interactive session died mid-upgrade and I
had to recover from a terminal.

Possible cause: the zfs key load unit was renamed from zfs-load-key-
rpool.service to [email protected].  When another package
(probabaly tpm-udev) postinst ran `systemctl daemon-reload`, that
triggered systemd to tear down everything bound to the inactive unit
including my interactive session.

(AI used to help with the diagnosis)

I was able to recover from the terminal by running `sudo-rs dpkg
--continue -a`, the upgrade also renamed the sudo command, which was not
very helpful.

1. Journal: old unit name was active at boot

  Source: journalctl -b 708732e878724076af5f58669bf97b65 (the boot the
upgrade ran in; currently -b -1).

  Oct 04 20:11:52.070422 shauns-framework systemd[1]: Starting 
zfs-load-key-rpool.service - Load ZFS key for rpool...
  Oct 04 20:11:52.070630 shauns-framework systemd[1]: Finished 
zfs-load-key-rpool.service - Load ZFS key for rpool.

2. dpkg.log: new zfsutils unpacked at 20:26:36, not configured until
after the failure

  Source: /var/log/dpkg.log

  2026-10-04 20:26:36 upgrade zfsutils-linux:amd64 2.2.2-0ubuntu9.5 
2.4.1-1ubuntu5.1
  2026-10-04 20:26:36 status unpacked zfsutils-linux:amd64 2.2.2-0ubuntu9.5
  2026-10-04 20:26:36 status unpacked zfsutils-linux:amd64 2.4.1-1ubuntu5.1
  2026-10-04 20:47:15 configure zfsutils-linux:amd64 2.4.1-1ubuntu5.1 <none>
  2026-10-04 20:47:18 status installed zfsutils-linux:amd64 2.4.1-1ubuntu5.1

3. Journal: first daemon-reload after the unpack, then immediate
teardown

  Same journal boot. The previous reload was at 20:25:53, before the
unpack.

  Oct 04 20:25:53 shauns-framework systemd[1]: Reloading finished in 634 ms.
  Oct 04 20:29:03.206292 shauns-framework systemd[1]: Reload requested from 
client PID 57039 ('systemctl') (unit [email protected])...
  Oct 04 20:29:03.206302 shauns-framework systemd[1]: Reloading...
  Oct 04 20:29:03.653210 shauns-framework systemd[1]: Reloading finished in 446 
ms.
  Oct 04 20:29:03.695839 shauns-framework systemd[1]: -.mount: Failed to 
enqueue stop job, ignoring: Job type stop is not applicable for unit -.mount.
  Oct 04 20:29:03.712815 shauns-framework systemd[1]: Stopping session-2.scope 
- Session 2 of User shaun...
  Oct 04 20:29:03.716485 shauns-framework systemd[1]: Unmounting root.mount - 
/root...
  Oct 04 20:29:03.802090 shauns-framework systemd[1]: Unmounting srv.mount - 
/srv...
  Oct 04 20:29:03.803488 shauns-framework systemd[1]: Unmounting 
usr-local.mount - /usr/local...
  Oct 04 20:29:03.862577 shauns-framework systemd[1]: Unmounting 
var-lib-apt.mount - /var/lib/apt...
  Oct 04 20:29:03.864176 shauns-framework systemd[1]: Unmounting 
var-lib-dpkg.mount - /var/lib/dpkg...
  Oct 04 20:29:03.866296 shauns-framework umount[57410]: umount: /var/lib/apt: 
target is busy.
  Oct 04 20:29:03.869937 shauns-framework umount[57418]: umount: /var/lib/dpkg: 
target is busy.
  Oct 04 20:29:03.884661 shauns-framework systemd[1]: Stopping 
systemd-journal-flush.service - Flush Journal to Persistent Storage...

ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: zfsutils-linux 2.4.1-1ubuntu5.1
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct  4 21:06:12 2026
InstallationDate: Installed on 2025-01-10 (632 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 
(20240827.1)
SourcePackage: zfs-linux
UpgradeStatus: Upgraded to resolute on 2026-10-04 (0 days ago)
---
ProblemType: Bug
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
CrashReports:
 640:120:109:276456:2026-10-04 20:29:05.410190207 +0100:2026-10-04 
20:29:04.444199653 +0100:/var/crash/_usr_bin_gnome-session.120.crash
 644:0:109:0:2026-10-04 20:53:35.751258651 +0100:2026-10-04 20:53:35.699258657 
+0100:/var/crash/kdump_lock
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 26.04
InstallationDate: Installed on 2025-01-10 (632 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 
(20240827.1)
NonfreeKernelModules: zfs
Package: ubuntu-release-upgrader-core 1:26.04.25
PackageArchitecture: all
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Tags: resolute wayland-session dist-upgrade
Uname: Linux 7.0.0-38-generic x86_64
UpgradeStatus: Upgraded to resolute on 2026-10-04 (0 days ago)
UserGroups: adm cdrom dialout dip docker lpadmin plugdev sudo users
VarLogDistupgradeTermlog:

_MarkForUpload: True

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

** Affects: zfs-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug apport-collected dist-upgrade resolute wayland-session

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https://bugs.launchpad.net/bugs/2169500

Title:
  Upgrade to 26.04 killed desktop session mid-upgrade due to zfs systemd
  unit rename

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