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I've upgraded to 12.04. My upgrade didn't go as expected; X crashed at the middle of the upgrade. I had to install many packages manually.

This left me with a GDM login screen. How do I change from GDM to lightDM?

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up vote 19 down vote accepted

Let me first tell you that now Ubuntu does not use GDM as its display manager in version 12.04...It uses lightdm as its display manager...

So the screen you want is actually lightdm.

So you will have to install lightdm as follows.

Enter these commands in the terminal:

sudo apt-get install lightdm

Install lightdm

After installing lightdm enter the following commands to set lightdm as the default display manager:

sudo dpkg-reconfigure lightdm

Then you will get the following screen:

Display manager explanation

hit enter and then you will get this screen:

Choose default display manager

Navigate your option to lightdm and hit enter.

Now Restart.

you'll get your screen :)

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