[Bug 2150239] Re: Software Updates hangs / crashes when toggling checkboxes in the list of available updates

[Chris]

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

Status in update-manager package in Ubuntu:
  New

Bug description:
  With a list of updates loaded in the list view of Software Updater,
  toggling checkboxes is very inconsistent. It often lags or just hangs.
  I see in the journal for instance,

  Apr 24 16:13:26 workstation update-manager.desktop[1300386]: Traceback (most recent call last):
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:   File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line 1097, in on_update_toggled
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:     self.toggle_from_items(data.group.items)
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:     ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:   File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line 1136, in toggle_from_items
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:     Fix.resolve_by_keep()
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:     ~~~~~~~~~~~~~~~~~~~^^
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]: apt_pkg.Error: E:Unable to correct problems, you have held broken packages.
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]: /usr/lib/python3/dist-packages/gi/overrides/GObject.py:646: Warning: ../../../gobject/gsignal.c:2723: instance '0x1fc83390' has no handler with id '7734'
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:   return func(*args, **kwargs)
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]: /usr/lib/python3/dist-packages/gi/overrides/GObject.py:646: Warning: ../../../gobject/gsignal.c:2723: instance '0x1ed27c50' has no handler with id '7717'
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:   return func(*args, **kwargs)
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]: /usr/lib/python3/dist-packages/gi/overrides/GObject.py:646: Warning: ../../../gobject/gsignal.c:2723: instance '0x200b1ee0' has no handler with id '7748'
  Apr 24 16:13:26 workstation update-manager.desktop[1300386]:   return func(*args, **kwargs)

  This is on Ubuntu 26.04

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