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Download the repo file and move it to the correct location:
$ wget http://download.opensuse.org/repositories/X11:/RemoteDesktop:/x2go/RHEL_6/X11:RemoteDesktop:x2go.repo $ sudo cp X11:RemoteDesktop:x2go.repo /etc/yum.repos.d/x2go.repo
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.