http://www.jb51.net/os/Ubuntu/104948.html

https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-vnc-on-ubuntu-14-04

sudo apt-get update

sudo apt-get install xfce4 xfce4-goodies tightvncserver

mv ~/.vnc/xstartup ~/.vnc/xstartup.bak

Now we can open a new xstartup file with vim

vim ~/.vnc/xstartup

Insert these commands into the file so that they are performed automatically whenever you start or restart your VNC server:

#!/bin/bash

xrdb $HOME/.Xresources

startxfce4 &

sudo chmod +x ~/.vnc/xstartup

$> vncserver