How to change from GDM to LightDM?

Enter these commands in the terminal-

sudo apt-get install lightdm

After installing lightdm enter the following commands to set lightdm as the default diplay manager-

sudo dpkg-reconfigure lightdm

Then you will get the following screen-

hit enter and then you will get this screen-


Navigate your option to lightdm and hit enter.

Now Restart.

you'll get your screen...

courtesy : ask ubuntu