Jellyfin Server - Ubuntu external drives

[mjpatey]

@theguymadmax thank you!!! That worked. It's been about 12 years since I've played around in Linux, and I've clearly forgotten some basics. @TheDreadPirate thank you as well for your amazing help and insight.

Server is up and running! I'd like to mark one post as the solution, but I was missing so much that I think all the posts are needed to show the full solution.

Thanks again to both of you.