Thanks for the bug report. Next time the problem happens please:
1. Reboot.
2. Run:
journalctl -b-1 > prevboot.txt
3. Attach the resulting text file here.
Also if you use a touchscreen then see bug 2125013.
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2124229
Title:
display freeze
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