It sounds like something is crashing. If you find any files in /var/crash then please follow these instructions:
https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment Otherwise, next time you have to restart using the power button, please run this command as soon as it restarts: journalctl -b-1 > prevboot.txt and then attach the resulting text file here. ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Incomplete ** Summary changed: - Xorg freeze + Screen freeze -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1892847 Title: Screen freeze To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1892847/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
