Quick howto to turn your machine into an X2Go server:

sudo apt-add-repository ppa:x2go/stable
sudo apt-get update
sudo apt-get install x2goserver x2goserver-xsession
sudo apt-get install x2gomatebindings # if you use MATE/mubuntu
sudo apt-get install x2golxdebindings # if you use LXDE/lubuntu

Quick howto to install the x2goclient:

sudo apt-add-repository ppa:x2go/stable
sudo apt-get update
sudo apt-get install x2goclient

Enjoy!