Finally making some headway, I tried the following:

1. boot the system.
2. at the graphical login prompt, switch to another console (Ctrl+Alt+F2)
3. login
4. logout

The screen displays the GUI login prompt but hangs. I can still login on
this console using the braille display.

5. Log in from another machine using SSH
6. sudo killall -ABRT gdm-x-session

The working GUI login prompt appears and lets me log in.

I now have a crash report of this call to killall. Should I report it,
and include its number here, as I did before?

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https://bugs.launchpad.net/bugs/1764643

Title:
  Logout after console use freezes GUI

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