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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.

enter image description here

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?

share|improve this question
Can you post a screenshot somewhere? – Jorge Castro Feb 26 '13 at 13:47
A screen shot of the log in prompt? – Tyler Childers Feb 26 '13 at 14:19
Yes, the "not typical Ubuntu log in screen", we need to figure that out first. – Jorge Castro Feb 26 '13 at 14:21
Will do later today, thank you. – Tyler Childers Feb 26 '13 at 14:27… This is characteristic of the screen I am currently getting. – Tyler Childers Feb 26 '13 at 16:07
up vote 1 down vote accepted

Since lightdm is the default in ubuntu, a different login screen means you installed some other display manager. It seems that you are currently using gdm, so to revert back just input this line in the terminal:

sudo dpkg-reconfigure gdm

and choose lightdm as the default display manager.

share|improve this answer
This looks like it will restore the login, but will it bring back the Ubuntu/Unity option? – Tyler Childers Feb 26 '13 at 16:48
If you have Unity installed (which I assume you have), it will. – João André Feb 26 '13 at 19:24
Bingo. Problem solved. Thank you to everyone for your help. – Tyler Childers Feb 26 '13 at 20:39

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