ubos-admin status reports “Systemd unit … has failed”

For example, when you run sudo ubos-admin status, you may get output:

% sudo ubos-admin status
Problems:
 * Systemd unit snapper-cleanup.service has failed.

In this case, Systemd service snapper-cleanup.service has failed.

In the following, replace snapper-cleanup.service with the name of the unit that failed):

1. Try to restart the service:

   % sudo systemctl restart snapper-cleanup.service
   

2. After a little while, check whether that fixed it by running sudo ubos-admin status --problems again. If not, read on.

3. To figure out why snapper-cleanup.service fails to start, ask for its log:

   % sudo journalctl -u snapper-cleanup.service
   

   If that brings up way too much information, you can limit the output to, say, the last 10 minutes, by invoking it as follows:

   % sudo journalctl -u snapper-cleanup.service --since -10m
   

That should give you enough information to figure out what the problem is.