jtimberman/plexapp-cookbook — pull request #1 by cwjohnston (2012-12-07 02:15:20+00:00)
Title: forcing installation of plex-archive-keyring package prior to installing plexmediaserver

This cookbook didn't work for me out of the box; apt was unhappy about the packages being unsigned.

Since it seems the repo maintainers haven't published their key on the default servers, I've modified the server_ubuntu recipe to force install the needed key from another package in the repo, then run apt-get update before installing plexmediaserver.