It looks like something has gone wrong with the graphics driver so next
time it happens please:
1. Reboot.
2. Run: journalctl -b-1 > prevboot.txt
3. Attach the resulting text file here.
If the Terminal doesn't work for long enough to do that then you can run
the command in a text login (Ctrl+Alt+F4).
** Package changed: ptyxis (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/2147480
Title:
Ubuntu Desktop GUI freezes
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