I'm using Ubuntu 12.04 (precise) AMD64.
It used to be that if you installed multiple window managers/desktop environments, you could select them at the login screen. You could also choose multiple options for a given environment (like gnome).
I have installed several window managers, but I don't even see on the new login screen any kind of session options AT ALL. No place for them to even show up. On the left hand side there is a list of users to pick, and if you pick one you get a password field, but no option to change what desktop to use.
I've done a lot of searching but I can't find any site or forum post that explains how to fix this. This is how it was out of the box. It seems like Unity is being forced on me. I would like to go back to fvwm if I can, and I have it installed, but I can't choose anything at login.
Where is this supposed to be? I have looked under every nook and cranny of the login screen and see nothing there that even relates to this.