This is an old revision of the document!
An X server is not a server for distributing your perfect models output!
An X server is basically a program running on your local computer that understands the X Windows System protocol used by the remote Linux servers to generate graphics, and that can render (i.e. display) the graphics on your local computer.
Nothing to do! Linux computers come pre-configured with a running X server (because they need it for displaying local graphics)
There are several options available