I get the same basic problem too, but with a slight variation.
I'm running XUbuntu 22.04 with latest updates (or at least latest
updates before update itself died!).
ProblemType: Crash
CurrentDesktop: XFCE
Date: Mon Jan 5 10:58:02 2026
ExecutablePath: /usr/bin/update-manager
ExecutableTimestamp: 1649663805
InterpreterPath: /usr/bin/python3.10
ProcCmdline: /usr/bin/python3 /usr/bin/update-manager
ProcCwd: /home/user
ProcEnviron:
LANGUAGE=en_GB:en
PATH=(custom, user)
XDG_RUNTIME_DIR=
LANG=en_GB.UTF-8
SHELL=/bin/bash
Traceback:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line
416, in restart_icon_renderer_data_func
if group_item.pkg and self.pkg_requires_restart(
File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line
391, in pkg_requires_restart
if pkg is None or pkg.candidate is None:
File "/usr/lib/python3/dist-packages/apt/package.py", line 1076, in candidate
cand = self._pcache._depcache.get_candidate_ver(self._pkg)
apt_pkg.CacheMismatchError: Object of different cache passed as argument to
apt_pkg.DepCache method
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
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https://bugs.launchpad.net/bugs/2010913
Title:
update-manager crashed with apt_pkg.CacheMismatchError in
marked_install(): Object of different cache passed as argument to
apt_pkg.DepCache method
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