_X11TransSocketINETConnect: Can't get address for yourdesktop
Exception in thread "main" java.lang.InternalError: Can't connect to X11 window
server using 'yourdesktop:0.0' as the value of the DISPLAY variable.
When the guide says "export DISPLAY=yourdesktop:0.0" you must replace yourdesktop with your host's IP address (if you are trying to install remotelly). If you are installing locally then use an xterm to install without caring about DISPLAY, or use "export DISPLAY=localhost:0.0".
In both cases if you use "export DISPLAY=..." you must run "xhost +localhost" at the local box to allow connections to the local X-server.