Since Ubuntu 11.10 Oneiric, LightDM replaces GDM as the default display manager. Then here comes the first GUI tool to manage Lightdm log-in screen appearance, and it’s called Simple LightDM Manager.

So far, Simple LightDM Manager only supports changing Log-in background and logo.

Installation

ppa:claudiocn/slm provides packages for Ubuntu 11.10 Oneiric user. Type following commands in terminal:

sudo apt-add-repository ppa:claudiocn/slm
sudo apt-get update
sudo apt-get install simple-lightdm-manager

Or directly download .deb package from HERE