Thank you. It turned out to be faulty RAM.
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https://bugs.launchpad.net/bugs/2055032
Title:
SEG/11 in Wayland _st_theme_get_matched_properties()
To manage
Thank you for taking the time to report this bug and helping to make
Ubuntu better.
However, processing it in order to get sufficient information for the
developers failed (it does not generate an useful symbolic stack trace).
This might be caused by some outdated packages which were installed on
