I will have to be strong not to fall into temptation, but it is that he calls me and calls me .. Anyway, before doing anything, I'd better test that everything works correctly in a virtual machine, but if you are brave, you can run this in a terminal:
$ sudo aptitude update
$ sudo aptitude upgrade
$ sudo aptitude install gnome-shell gnome-session gnome-session-fallback
If you use LMDE and you have activated the repositories of Debian Testing, you can also install it without problems (in theory).
For my part, I can only grab the few hairs that I have left and endure like a man: '(