SOLVED: Service Failed To Start

[LeeJS]

Go to /etc/jellyfin in the container and look for empty XML files (probably migrations.xml).  You can also try renaming all the XML files in there and let Jellyfin regenerate them from defaults.

The issue is resolved, but I'm adding additional information for anyone who may stumble onto this in the future:

@TheDreadPirate was right, the migrations.xml file was empty. I renamed it. Restarting the service regenerated the file. However, the service would still not start. After restarting the service, it went into a an "inactive (dead)" state. Systemctl status output: https://sourceb.in/6pkSv9ZdMz. The journal is showing was error during migration. "Could not apply migration 'MigrateActivityLogDatabase' " (https://sourceb.in/FXqhTrlZV0). The other threads I've seen on this issue seem to indicate a permissions issue, but my log shows there is no such "ActivityLog" table.

Renaming the system.xml file and restarting the service was also required for the service to start!

Thank you very much!

I've just had the exact same problem and your steps fixed the issue, so thank you for that first off.
My question is why did this happen and what can I do to stop it happening again?
I've run Jellyfin under Docker for years and this has never been an issue. Suddenly I move to an LXC and it crashes within a matter of days for no reason. I'm contemplating moving back to a Docker install if this can't be explained