[SOLVED] changing DE at login

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http://ubuntuforums.org – This is getting prettty frustrating - I have lots of threads about how to install a different DE on Ubuntu. They all seem make the assumption that there will simply be a choice at login. Well I installed Cinnamon from the software center - too easy I can get no choice at login I tried this cmd "sudo apt-get install gnome-session-fallback" supposedly that envokes the choice - no joy. I cannot seem to find how to actually switch DE once installed. (Hardware)