The crash is probably bug 2050865 which is rolling out in automatic updates
this week. And since you're using Xorg it's possible that crash is happening
even more often than you know, because gnome-shell will just automatically
restart on Xorg with apps still running. So if you don't already have the
update, please follow:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2050865/comments/44
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Tags added: multimonitor suspend-resume
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https://bugs.launchpad.net/bugs/2075525
Title:
After screen blank, the displays configuration gets lost
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