[Bug 2040072] [NEW] user session closes during installation when 'keyboard layout' button is pressed

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Once the keyboard selection window is displayed during the ubuntu mate
22.04 installation if 'keyboard layout' button is displayed, the user
session abruptly closes. The computer is a Thinkpad T400 where
previously ubuntu mate 20.04 was running (the boot disk failed and I
replaced it with a new one).

Here I enclose the resulting logs.

However, after trying again (avoiding to press the referred button) and
once the installation successfully was finished, if the applet 'workload
switcher' Preferences option on the bottom panel is selected, the same
error happens. And it also happens when a PDF file is loaded in Atril
application.

I could reproduce this error with the three releases of ubuntu-mate:
22.04.01, 22.04.02 and 22.04.03

As I couldn't fix the problem by myself I had to erase the installation
and install ubuntu-mate 20.04.06.

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

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user session closes during installation when 'keyboard layout' button is pressed
https://bugs.launchpad.net/bugs/2040072
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