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How to install budgie desktop on elementary os ( Loki )?

To install this I used an Ubuntu guide: http://www.omgubuntu.co.uk/2016/09/install-budgie-desktop-on-ubuntu but it doesn't work as expected.

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?