the log has a gnome-shell segfault and that error "setup_framebuffers:
assertion 'width > 0' failed"
do you have any apport report in /var/crash?
** Package changed: gnome-session (Ubuntu) => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => High
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1723882
Title:
Ubuntu session crashes sometimes when notifications appear
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