NoMachine

NoMachine NX handles remote X Window System connections, and attempts to greatly improve on the performance of the native X display protocol to the point that it can be usable over a slow link such as a dial-up modem. It wraps remote connections in SSH sessions for encryption.

Install

NoMachine NX requires installation both on the server and client side. Detailed installation instructions for both can be found here.

NX Server

Get it from here.

On Ubuntu, download the 3 packages client, node and server, then install them:

sudo dpkg -i nxclient_3.4.0-7_i386.deb 
sudo dpkg -i nxnode_3.4.0-14_i386.deb 
sudo dpkg -i nxserver_3.4.0-14_i386.deb

Control the service with

/usr/NX/bin/nxserver --status|--start|--stop|--restart
/usr/NX/bin/nxserver --help                               # help instruction

Don't forget the server administration manual.

NX Client

Get it from here