Very happy Jellyfin user thinking of switching from Windows to Linux

[TheDreadPirate]

• Which distributions should I care about when Jellyfin is the main focus? I don't want anything unofficial or hacked together, just whatever is optimized for the smoothest Jellyfin experience. I'm thinking Ubuntu or Debian but definitely open to suggestions.
  

Anything Debian based.  Primarily because a lot of people use it, thus lots of forum/reddit posts throughout the internet, and pretty much any FOSS project that releases their software in some variety of Linux package will have a DEB package.  Other package types are hit or miss, like Jellyfin not having official RPM packages.

• I see some guides for migrating an existing Jellyfin Library that I can follow, but being totally new to Linux, are there any Windows > Linux suggestions I can implement before starting?
  

If you migrated to Linux, you'd have to start over with Jellyfin.  Not your media, but your users and watch status, etc.  There used to be a migration script someone wrote to go from Windows to a Dockerized Jellyfin, but it hasn't been updated since 10.9 was release and it may not be compatible any more.

• Does networking/firewall/IP address information translate over fairly well?
  

I'm not sure what you're asking here.

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Ninja'd