In UpdatesAvailable.py:toggle_from_items(), when the user toggles an update
checkbox, the code calls apt_pkg.ProblemResolver.resolve_by_keep() to fix any
dependency breakage. If the system has held broken packages, this throws
apt_pkg.Error: Unable to correct problems, you have held broken packages —
which is unhandled and crashes the entire Software Updater UI.
Full traceback from the reporter's journal:
File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py",
line 1097, in on_update_toggled
self.toggle_from_items(data.group.items)
File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py",
line 1136, in toggle_from_items
Fix.resolve_by_keep()
apt_pkg.Error: E:Unable to correct problems, you have held broken packages.
Wrap the resolve_by_keep() call in try/except apt_pkg.Error. If the resolver
fails, log a warning and continue — the UI stays responsive and the user can
still work with the update list. The worst case is that the package selection
remains in a broken state, which is strictly better than the entire application
crashing.
** Patch added: "update-manager-resolve-crash.patch"
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/2150239/+attachment/5971441/+files/update-manager-resolve-crash.patch
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https://bugs.launchpad.net/bugs/2150239
Title:
Software Updates hangs / crashes when toggling checkboxes in the list
of available updates
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