I have Ubuntu 12.10 installed along with Plex Media Server 0.9.7.x (I don't remember, the latest version anyway). I had Plex set up on a Mac, and I had all of my media content stored in an external HDD formatted as HFS+ Journaled. I know Linux can't write on HFS+ (at least easily), but it reads natively.
When I try to add a section to my Plex server (from the web manager), it sees my external HDD but it can't see its content.
Is this a known issue? I couldn't find anything about this online.