Follow this instruction to install vncsrver step by step
https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-vnc-on-ubuntu-14-04
if copy paste can't work u can do this:
install autocutsel
sudo apt-get install autocutsel
add autocutsel -fork on ~/.vnc/xstartup
#!/bin/bash
xrdb $HOME/.Xresources
autocutsel -fork
startxfce4 &
restart vncserver
run this at local, u can connect to vnc dekstop via ssh
ssh -L 5901:127.0.0.1:5901 -N -f -l user ipaddress
and connect with vnc viewer (such as tigervnc or realvnc) with this input at vncserver setting
localhost:5901