== System information ==
Ubuntu 23.10, up to date before today’s updates.

== Steps to reproduce (WIP) ==
0. have a group of packages that are kept back from updating, plus some that aren’t (screenshot demonstration attached) below
1. open update-manager
2. (try to) open the kept group, click on their (unchecked) checkboxes
3. do the same for some of the other, non-kept packages
4. repeat 2.-3. for a while

== What happens ==
Update-manager becomes unresponsive, then eventually segfaults:

update-manager[3292]: segfault at 30 ip 00007fc0718b4c41 sp 00007ffc2cca6a68 error 4 in libgobject-2.0.so.0.7800.0[7fc071889000+34000] likely on CPU 4 (core 0, socket 0)

== Other info ==
I’ve marked the steps above WIP because these are the conditions under which I found this today, but I haven’t yet tried narrowing them down, because of course I have little control over which updates are available. (For instance, the kept packages might just be a red herring.)

I initially tried to report the crash file with ubuntu-bug, but despite asking preliminary questions, in the end it never opened a browser to complete the report. I’ll try apport-collect next, but if that fails too, I’ll just attach the crash file here manually.