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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.
Check that you have activated the “optional” channel:
$ sudo rhn-channel -l
If the optional channel for your base channel is not active, activate it. e.g.:
$ sudo rhn-channel --add -c rhel-x86_64-server-optional-6