you're using the nvidia driver, and since it seems to be a bug in the driver, there's nothing much we can do about it
also, 340 series was just annouced to be EOL ** Package changed: xorg-server (Ubuntu) => nvidia-graphics-drivers-340 (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853707 Title: Whole system stopped responding because of single program's fault - no way out, had to force power off To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1853707/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
