Dual boot solutions

[bitmap]

You'd need to have a location available to both installations for read/write for the DB, etc. It would also have to map perfectly to both OS's. So....maybe? You might have to run Jellyfin in Docker on Linux and map that location to the correct config directory. I honestly think this is too complex to work the way you're hoping, much less seamlessly. It sounds like a recipe for a corrupted DB.

ETA: Can you not get a mini-PC for a couple hundred bucks? Or a used office machine (e.g., Dell Optiplex) to have as an actual server? Personal machine as server defeats the purpose of a server.