I had an Ubuntu system eat itself Christmas Eve at 1am. I think an update pooched some folder permissions and wiped the firewall settings.
It started with "Huh, the network drives won't mount", progressed to containers failing to start with "hardware not found" GPU-related errors -oh yeah, I still have to check that and make sure it is working- and yadda yadda... 13 hours later I got services back up and running.
Oof, today I slept in until 10. Ahhhhh...