How can I launch a GUI session on a remote Ubuntu Desktop via SSH from a non-GUI Linux shell?

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http://serverfault.com – I am setting up a test environment, made up of various Linux boxes, and I have the need to launch an instance of Firefox on a remote machine via ssh. The remote machine has Ubuntu Desktop (11) and Firefox installed. The source machine is a Continuous Integration server and it creates an ssh session to the remote machine from a non-GUI environment. It then runs a script, which tries to launch Firefox on the remote machine. However, since the ssh session is a from a non-GUI environment, there is no display. Is it possible to have a headless X-windows display? i.e. a virtual display in the re (HowTos)