Mint 14 Mate 64-bit is the system. Here is the situation:
I was trying to create a Docky launcher that brings up the MATE shutdown dialog. I now know the correct command to use is "mate-session-save --shutdown-dialog" however I tried to mimic the command I used on my Mint 14 Cinnamon machine, which is "gnome-session-quit --power-off." The command did not work and the terminal spit out something like "thats currently not installed, you can install it with sudo apt-get install gnome-session" which I foolishly did (I don't exactly remember the name). Now after login there is a single dialog box that says "failed to load session ubuntu" and at that point I cannot do anything except hit the power button.
I have all the data backed up so I am not worried about doing a fresh reinstall, if it comes to that, but it would still be a pain in the backside. Is there someway I could login via recovery mode to fix this? Some additional clues: I was using Compiz, and I believe it was acting as the window manager.
Any help would be appreciated.