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This actually isn’t a supported method. You don’t want to install anything on top of Proxmox as you run the risk of it being auto removed on an upgrade. You should make a VM and run Docker on that VM.

This looks very cool. One of my biggest issues with Jellyfin is its UI. So I just stay with Plex. There are some other features that keep me in Plex but it’s mainly the UI. I’ll be starring this and keeping an eye on it! Well done.