Install

# dependency
sudo apt-get install ubuntu-desktop gnome-panel gnome-settings-daemon metacity nautilus gnome-terminal

# VNC Server
sudo apt-get install vnc4server

# After install, run vncserver and set the password when prompted
vncserver

Modify ~/.vnc/xstartup

#!/bin/sh

# Uncomment the following two lines for normal desktop:
# unset SESSION_MANAGER
# exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
x-window-manager &

gnome-panel &
gnome-settings-daemon &
metacity &
nautilus &

Execute

# Kill the current vncserver and restart
vncserver -kill :1
# vncserver defaults to port 5900; :1 is 5901, and so on
vncserver :1

Start vncserver on reboot

@reboot /usr/bin/vncserver :1