Ok, I know I can get the source from here:
http://github.com/gewalker/plex-linux
But where in the world can I get the Ubuntu 11 binary, there is no link on the README FIRST thread.
There is currently no binary package.
According to this there are:
http://forums.plexapp.com/index.php/topic/34590-read-me-first-pmc-linux-faq/
Second line:
UPDATE: Binary Packages now available for Ubuntu 11.10!