Thanks for the bug report. Next time a freeze happens please:
1. Wait 10 seconds.
2. Reboot.
3. Run:
journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here.
5. Also check for crashes by following https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment
6. Maybe also subscribe to bug 1970495.
Thanks for the bug report. Next time a freeze happens please:
1. Wait 10 seconds.
2. Reboot.
3. Run:
journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here.
5. Also check for crashes by following /wiki.ubuntu. com/Bugs/ Responses# Missing_ a_crash_ report_ or_having_ a_.crash_ attachment
https:/
6. Maybe also subscribe to bug 1970495.