version: latest as of Aug 7, 2014

The wiki instructions at http://wiki.x2go.org/doku.php/doc:installation:x2goserver and http://wiki.x2go.org/doku.php/wiki:repositories:ubuntu
are correct for ubuntu 12.04, however the following has changed in 14.04, the current LTS version.

 add-apt-repository

has moved from python-software-properties

to python-software-common

I don't know anything about other versions.