Amazon aws - view ubuntu desktop using VNC

Setting up VNC on Ubuntu in Amazon EC2
Install the desktop packages and remote desktop (VNC) server:

sudo apt-get update
sudo apt-get install ubuntu-desktop
sudo apt-get install vnc4server

Configure the VNC server enter vncserver, which will then prompt you to create a password. Once created, entervncserver -kill :1 to stop the server.

edit the config file: ~/.vnc/xstartup.

Uncomment the two lines below the string "Uncomment the following two lines for normal desktop." And on the second line add "sh" so the line reads exec sh /etc/X11/xinit/xinitrc. 

Start the VNC server again by entering vncserver. 

Open VNC through Tunneling putty :

References:
http://crl.ucsd.edu/handbook/vnc/