How to Change the LightDM Login Screen on Ubuntu 13.04

Hello Linux Geeksters.

In this article I will show you how to set a new background wallpaper on Ubuntu 13.04 LightDM login screen.

This is what you have to do for changing the LightDM login screen on Ubuntu 13.04:

Switch to root:

$ sudo su

Execute this command to make the lightdm user able to create a connection to the x server:

$ xhost +SI:localuser:lightdm

Switch to the lightdm user:

$ su lightdm -s /bin/bash

Turn off the dynamic background for Lightdm:

$ gsettings set com.canonical.unity-greeter draw-user-backgrounds 'false'

Set a new background:

$ gsettings set com.canonical.unity-greeter background '/path/to/image'

Replace /path/to/image with your image. (example: /home/linuxg/r2d2.png)