SOLVED: emby and jellyfin on same server

[TheDreadPirate]

some time ago I also tried to install both servers
very important is to stop emby already installed first and then install jellyfin. Then stop jellyfin and change port.
then both servers start
must works

This.  I have 5 Jellyfin instances running on my server, my production instance directly on Ubuntu on port 8096 and 4 docker containers for testing.  Each time I added a new container I had to stop my production instance on 8096 to stand up the new one and reconfigure the network port.  If you are using host networking using the publish port function won't work.