Change Linux display manager

You can have mulitple diplay manager installed at any time:

• gdm
• lightdm
• kdm

You can switch between them:

• if you have gdm running then use

sudo dpkg-reconfigure gdm

• if you have kdm running then use

sudo dpkg-reconfigure kdm 

• if you have lightdm running then use

sudo dpkg-reconfigure lightdm