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

[Charles]

Public bug reported:

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

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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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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