At seemingly random time, my GUI locks up. I can generally recover from this (sort of) by getting another session via ssh and running sudo init 3 ; sudo init 5 but I lose any work in progress in all of my running GUI apps.
- What could be causing this?
- How can I identify the problem?
- How can I make this quit happening?
I've searched for a few obvious things but all the results I've found so far are "how to recover" and none of them "how to make this not happen again".
A few other facts:
- The system end up almost entirely un-responsive to the keyboard/mouse; even
ctrl+alt+F# and caps-lock gets no response.
- If it happens while I'm playing a video, the visual portion of the video freezes but the audio usually continues for at least a few minutes.
- If I wait long enough, it sometimes recovers and sometimes I see indications that it process at least a few inputs from the keyboard/mouse (e.g. the cursor move a few pixels, changes type or that kind of thing).
- Those
init commands take much longer to run while recovering than they do at other times.
- This has happened both before and after upgrading to 20.04 (I think I was on 18.04 before).
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
