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How do I switch from the default display manager (Lightdm) to the older display manager (GDM)?

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You can select the correct answer by checking the checkmark next to the answer instead of using SOLVED. –  Jorge Castro Jul 11 '12 at 1:56
    
Please remember to accept/upvote the best answer(s) to your question when possible (tick/check mark on the left). This way, the question is marked as "answered" and future readers can refer to it knowing the solution works. Thank you...:) –  izx Aug 8 '12 at 8:29

2 Answers 2

up vote 12 down vote accepted
+100

Switching from LightDM to the "older" GDM is very easy, and need not even involve opening a terminal.

Note:

  • If you need/want to do this from a terminal (e.g. recovery console), please scroll below the screenshots for a how-to.
  • 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.

Easily switch to GDM with the Software Centre

  1. Open the Software Center, type "gdm" in the search box, and click on Install as shown below, or click on this button: gdm Install gdm

    enter image description here

  2. After you enter your password, you will get the configuration screen shown below. Change lightdm to gdm and click on Forward:

    enter image description here

  3. 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.

    enter image description here


Switch to GDM via the terminal

  1. Open a terminal with Ctrl+Alt+T if you are on the desktop and not in the recovery console.

  2. Type sudo apt-get install gdm, and then your password when prompted.

  3. A "Package Configuration" dialog will be displayed; click OK to proceed to the below screen. Use the arrow-keys to select gdm instead of lightdm, press Tab to move to OK, and press Enter.

    enter image description here

  4. Reboot the computer (you can do this with sudo reboot if in the recovery console).

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NOTICE that mateo said that it does not work for 12.04 - that has been my experience. Ron –  Ron Belcher Aug 10 '12 at 21:17
    
I'm sorry? These screenshots were taken on 12.04. Stock gdm works perfectly. All Mateo did was add the one-click install link... –  izx Aug 11 '12 at 0:52

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. 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.

I ran sudo dpkg-reconfigure gdm then sudo service lightdm stop

after this you will need to press alt+f2 and login from command line. Then you will be able to start sudo service gdm start separably.

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