Public bug reported:

This concerns tumbler 0.2.8-1 in Ubuntu focal.

Symptom: When I log into the Xubuntu desktop environment, the desktop
begins to appear on the screen, but then the X server dies and I am
unceremoniously returned to the LightDM login screen.

If I uninstall tumbler, then I can log into the desktop environment
without issue.

I performed further testing, with tumbler installed. I looked at the
shared libraries in /usr/lib/x86_64-linux-gnu/tumbler-1/plugins/, and
experimented with removing/replacing them.

I've confirmed that removing tumbler-gst-thumbnailer.so is enough to
make the crash go away. Conversely, leaving it in as the only plugin
causes the crash to occur.

Because this library is a D-Bus plugin, I do not know how to debug it.
There is no crash file for tumbler in /var/crash/ (but I see ones for
xfsettingsd and the Xorg X server).

** Affects: tumbler (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: focal

** Tags added: focal

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https://bugs.launchpad.net/bugs/1871318

Title:
  tumblerd GStreamer plugin crashes on startup, causing desktop session
  to exit

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