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X2Go Client is part of Ubuntu 12.04 and 12.10 as well as Debian Wheezy. Install it using the software center or by following command:
apt-get install x2goclient
Please see the detailed information: x2goclient
Please see X2go's Server Core for detailed documentation.
You might have to install
add-apt-repository first using:
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:x2go/stable sudo apt-get update sodo apt-get install x2goserver