Set Up VNC on Ubuntu in Four Easy Steps


1) Install packages.
sudo apt-get install x11vnc vnc-java
2) Set up a password for clients.
x11vnc -storepasswd
3) Open up ports 5800 and 5900 on your firewall
4) Run the terminal command.
sudo x11vnc -forever -usepw -httpdir /usr/share/vnc-java/ -httpport 5800 
and add it for auto-starting in future sessions