Thanks for the bug report.
First, please follow these instructions to check for crash reports which
might explain the issue:
https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment
Second, next time the problem happens please:
1. Wait 10 seconds.
2. Reboot.
3. Run:
journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here.
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
** Summary changed:
- Xorg crash
+ System freezes
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https://bugs.launchpad.net/bugs/1934450
Title:
System freezes
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