If just the titlebars disappear then that means you have indeed lost the
window manager. A basic image remains on screen because Xorg is still
Please have a look in /var/crash for *.crash files. And then run ubuntu-
bug on each:
That should create a new bug with traceable details about the crash(es).
We can't really do anything in this bug without such details.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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gnome-shell crashes often on unlock / resume from suspend
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