i know there are some couple of tut in this already but this one is just simple and fast 
after you installed your OS ,, connect your vps with putty

so start with 

sudo apt-get update -y

then 

sudo apt-get install ubuntu-desktop -y

after this type 

sudo apt-get install vnc4server -y

and then

sudo apt-get install gnome-panel -y

you succefully install ubuntuDesktop :giddy::giddy:

... now type
vncserver 
and enter your 8 digit password two times

then kill the process 
vncserver -kill :1

and edit the vncsever by 
vi .vnc/xstartup

and edit like this :-

#!/bin/sh
# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
# exec /etc/X11/xinit/xinitrc
gnome-session –session=gnome-classic &
gnome-panel&


press ECS and then :WQ to save the file

and then start the vncserver 
by typing :- vncserver
and you done connect with your vps with tigervnc viewer = https://github.com/TigerVNC/tigervnc/archive/v1.6.0.zip

enter ip address of your vps
and 5901 in port 
and you done :) 

pm me for help ! :giddy::giddy::giddy::wink::awyeah::awyeah: