ubuntu trusty plex home theater

Im using (L)Ubuntu 14.04 Trusty on my Orange Pi Plus (Rasberry Pi Clone).

I followed the isntructions for the Plex Home theater on page: blog.hack.cd/plex/

Hoever on the last command when we install plexhometheater:
sudo apt-get install plexhometheater

I get error message saying:
E. Unable to locate package plexhometheater

anyone seen this?

brgs

Bjorn