I use Ubuntu 14.04 with GNOME 3.10
Some time ago i set my default login shell to be GNOME and i can't choose anything else but GNOME now.
Simply when i have the choice to login as me or guest, when i click on my profile, I get logged in.
There is no way to choose with what shell I want to log in.
I don't remember where did I set the default login shell to be GNOME.
How can I undo this change? I want to be able to login with standard ubuntu 14.04 shell.