Jellyfin Media Server installation instructions for Ubuntu 20.04 or 22.04 can be found in a tutorial by Linux Capable.
How to Install Jellyfin Media Server on Ubuntu 22.04 or 20.04
Learn how to install Jellyfin Media Server on Ubuntu 22.04 or 20.04 and configure it to stream media files on your network or remotely; here is a step-by-step guide.
How to Install Jellyfin Media Server on Ubuntu 22.04 or 20.04 - LinuxCapable