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[TheDreadPirate]

Let's try reinstalling Jellyfin. We are going to backup your jellyfin data, just in case, but this shouldn't touch it.

Code:

sudo mkdir /jellyBackup
cd /jellyBackup
sudo rsync -a -p --progress /var/lib/jellyfin libJellyfin/
sudo rsync -a -p --progress /etc/jellyfin etcJellyfin/
sudo rsync -a -p --progress /var/cache/jellyfin cacheJellyfin/
sudo apt install --reinstall jellyfin*