failed to load session "ubuntu" at boot [SOLVED]

[nspboarderdude]

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.

[catweazel]

There should be an option to choose a different session at the login screen. Try selecting one from there before troubleshooting further.

[nspboarderdude]

Thanks, that helped. It was actually an easier fix than I had thought. I simply used the graphical login to reset the default session back to MATE. The problem was that I had edited the /etc/default/grub file to disable MDM for a faster boot, so that solution hadn't even occurred to me. All I had to do was edit the grub file, log in, edit the file again, and now everything functions as it should. Easy 5 minute fix.