Update Manager crashes when unselecting any package in Ubuntu 23.04

[Lukáš Chmela]

Update Manager crashes every time I unselect, or no later than when I re-select an offered package to be upgraded in Ubuntu 23.04. No crash handling dialog window ever pops up (why?), no stack trace is available when update-manager is launched from terminal. The only output I was able to get from a terminal window is this:

~$ update-manager
Segmentation fault (core dumped)

The manager crashes every time I have to modify the list of updated packages probably since the installation of Ubuntu 23.04. I had to do an upgrade from Ubuntu 22.10 to an RC of Ubuntu 23.04 if I remember correctly, because the new installer of Ubuntu 23.04 did not offer installation to a secondary LUKS-encrypted partition in a dual boot with Windows (only full-disk erase was offered). I later discovered that my /boot partition is too small to contain firmware update images and, since the last few days, also new Linux kernel. This is typically what I try to unselect, which makes the upgrade-manager window disappear silently and never re-appear again.

~$ lsb_release -rd
No LSB modules are available.
Description: Ubuntu 23.04
Release: 23.04

~$ apt-cache policy update-manager
update-manager:
  Installed: 1:23.04.2
  Candidate: 1:23.04.2
  Version table:
 *** 1:23.04.2 500
        500 http://cz.archive.ubuntu.com/ubuntu lunar/main amd64 Packages
        500 http://cz.archive.ubuntu.com/ubuntu lunar/main i386 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.