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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 command to add the ppa:x2go/stable as a package source to your local system:
$ sudo add-apt-repository ppa:x2go/stable