Share my personal experiences using Linux.Also find some information from here http://bgkavinga.blogspot.com
Enable X sharing on ubuntu
Normally Ubuntu doesn't allow X server to listen on any port.To enable X server listen on port 6000 edit /etc/gdm/custom.conf
finally restart.Still you can't user X server from outside because it has kind of firewall on it.To disable fire wall run
in terminal.Now the X server is available for outside access.The above command xhost + will disable entire firewall so there is a security risk if your machine is in a network.read xhost man for more accurate configurations.
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