lightdm

Change login screen

/usr/share/lightdm/lightdm.conf.d/*.conf
/etc/lightdm/lightdm.conf.d/*.conf
/etc/lightdm/lightdm.conf

[SeatDefaults]
user-session=name

[SeatDefaults]
greeter-session=name

sudo apt-get install dconf-editor

sudo -i

xhost +SI:localuser:lightdm

su lightdm -s /bin/bash

dconf-editor

com –> canonical –> unity-greeter