How do I switch from the default display manager (Lightdm) to the older display manager (GDM)? Switching from LightDM to the "older" GDM is very easy, and need not even involve opening a terminal.
Also, the "new" GDM is not covered here because it is not officially available for 12.04 and the unofficial packages do not work for most users.
Restart your computer, and you should now have the "old" GDM login screen; note that you can still select from any available session, including Ubuntu (3D), Ubuntu 2D, Gnome, Gnome Classic, etc. Type sudo apt-get install gdm, and then your password when prompted or run sudo dpkg-reconfigure gdm then sudo service lightdm stop, in case gdm is already installed. A "Package Configuration" dialog will be displayed; click OK to proceed to the below screen.

Gnome-display-manager is not broken in 12.04 (or at least it works fine for me), There is no need to reboot the machine. Not the answer you're looking for?Browse other questions tagged command-line lightdm gdm display-manager or ask your own question.
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Use the arrow-keys to select gdm instead of lightdm, press Tab to move to OK, and press Enter. You ran the right commands, but maybe try it this way, also might want to sudo apt-get install gdm just to make sure you have the working version.

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