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()
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Public bug reported:
Crashed after unlocking session from being away for a couple days.
Crash report ID is c81ddc34-d487-11ee-ba77-fa163e171f02
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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