Another vote for Debian, and I’ll suggest you go ahead and install Jellyfin directly rather than messing with Docker.
https://jellyfin.org/downloads/server
I’d been running JF under Docker on my NAS, but when I moved to a new server I decided to just install it directly and it hasn’t been any problem at all. You’ll get a notification when it needs to be updated and it’s just a few clicks to do so. You won’t have to fight with Docker to get hardware acceleration working - which isn’t to say it won’t be a PITA, but it’s one less layer of complication.
Capitalism is bad and they should install Linux.
Steve Wozniak. He’s so important that his last name isn’t flagged by Firefox’s spellchecker.
Use
https://github.com/amarpersaud/python-jplaw
to interact with Lemmy (make sure it’s v0.1.7+ since 0.1.6 had a bug and couldn’t create posts) and
https://github.com/praw-dev/praw
to interact with Reddit
IMO, for the average user, leading with anything about self-hosting is just asking for trouble. The basic pitch should be “Go to Lemmy.world. Sign Up. Search for communities and join them.”
You can replace Lemmy.world with the instance of your choice, of course, but even asking people to choose a server is enough of a deterrent that you’ll lose casuals. Now, maybe that’s a good thing, but that’s a different argument.
If you encourage people to look into self-hosting, or imply that it’s required, they’ll run the other way as soon as they look into the details.
Masochism, paranoia.