Install x11vnc
sudo apt-get install x11vnc
Set password
x11vnc --storepasswd
Run
x11vnc -rfbauth .vnc/passwd -auth /var/run/lightdm/root/:0
Just notes from my thoughts
Install x11vnc
sudo apt-get install x11vnc
Set password
x11vnc --storepasswd
Run
x11vnc -rfbauth .vnc/passwd -auth /var/run/lightdm/root/:0