I am a linux beginner using elementary os, i am asking this question here as elementary is based of ubuntu. 
To install this i used an ubuntu guide this: http://www.omgubuntu.co.uk/2016/09/install-budgie-desktop-on-ubuntu
but at this doesn't work - it doesn't show a unity greeter session menu like described in the article. What did i do wrong, or rather what went wrong and how can i rectify this issue