jellyfin-server dissappears after few seconds.

[Host-in-the-Shell]

Also, once properly mounted, does your media directory has the correct permissions set up for the jellyfin server to access its content? 

If Jellyfin is running under its own user, I would probably try

Code:

sudo chmod -R 755 /path/to/your/media

then add the jellyfin user to your user group, and assign owners:

Code:

sudo usermod -aG yourusername jellyfin
sudo chown -R yourusername:yourusername /path/to/your/media

Make sure your media is somewhere outside your home directory. If you want the jellyfin user to be able to write files, such as nfo and other metadata, I think you need to use 775 instead of 755, at least that's how it works for me. If you don't have a group for your user, you can make one with

Code:

sudo groupadd yourusername

but Kubuntu being Ubuntu based I imagine it's already created by default.