I found a solution.
https://github.com/jellyfin/jellyfin/is ... -794142731
-Download manual jellyfin-web package:
https://repo.jellyfin.org/releases/serv ... -1_all.deb
-This package appears to be in the /usr/share/jellyfin/web directory
-I deleted the contents of that directory manually.
-I installed the downloaded web package with dpkg -i.
-The web interface works again!
EDIT: The interface works but I can't paly content.
EDIT 2: https://github.com/jellyfin/jellyfin/is ... -794191785
Also if you end up removing dir /usr/share/jellyfin/web, you also lose given config file. So either back it up, or pull new from the same debian package. I had to do it manually for some reason.
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nice you found it. Looks apt package update to latest Jellyfin version has some challenges. good to keep it in mind if there are more users.
Pls let us know if a solution is working. This could help others if they hit by similar situation. Your DietPi Team