The agent is part of the Unsupported Appstore plugin. Installing it, will make installation and updates of the agent very easy. You can find the appstore here: https://forums.plex.tv/index.php/topic/151068-unsupported-app-store-as-in-totally-unsupported-is-currently-offline/
Alternatively you can install manually by downloading the zipped bundle from github, extract it, rename it to XBMCnfoMoviesImporter.bundle.
User MattJ from the plex forum reported the following steps to install on ubuntu 14.04:
- Download from github and unzip
- Remove "-master" from the end of both folder names.
- Copy them to the folder: /var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Plug-ins
- Find the group number for user "plex" by command "id plex".
- "cd" to folder in step 3 and change ownership of both XBMC bundles: "sudo chown plex:{gid} XBMC*"
- run "sudo service plexmediaserver restart". Done.