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)
Thanks, it help me a lot… 😀