From our nightly-builds on Ubuntu Launchpad we regularly copy package to the Launchpad PPA: ppa:x2go/stable.

Please use this PPA for installing X2go on Ubuntu platforms (amd64/i386, lucid/maverick/natty). Use the follwing commands to add the ppa:x2go/stable as a package source to your local system and perform a search for X2go-related packages:

$ sudo add-apt-repository ppa:x2go/stable
$ aptitude update
$ aptitude search x2go
$ ...

Congratulations, you are now able to access the X2go packages. You may continue by installing x2goserver, x2goclient or pyhoca-gui or any other of the available packages.