When I turn my computer on a screen comes up asking me for a password. This is not the typical Ubuntu log in screen, but it looks like the Gnome log in.
Usually this gives me a choice of what to log in to: Unity, Gnome, Gnome no effects, etc.
This time around I have no choice, it just takes me into the current version of Gnome (don't know to call this the shell or Gnome 3).
Everything works fine, but the normal Unity session is missing, as are the other Gnome options.
How do I get the option to select Unity back?