For reference, this feature got added to lightdm and removed from gdm while in my opinion it should have stayed in gdm also since mandatory for many setups:
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/803858
For reference, this feature got added to lightdm and removed from gdm while in my opinion it should have stayed in gdm also since mandatory for many setups:
https:/ /bugs.launchpad .net/ubuntu/ +source/ lightdm/ +bug/803858