How to customise LightDM Login Screen in Ubuntu to Remove Guest Account, Remote Login, White dots, Sound effect, and to Change the Background Terminal Commands sudo apt-get install dconf-tools (for Ubuntu 13.04 and before) sudo apt-get install dconf-editor (for Ubuntu 13.10 onwards) sudo cp /etc/lightdm/lightdm.conf /etc/lightdm/lightdm.conf.old sudo /usr/lib/lightdm/lightdm-set-defaults sudo xhost +SI:localuser:lightdm sudo su lightdm -s /bin/bash dconf-editor exit Or use gsettings for Terminal method of editing dconf gsettings set com.canonical.unity-greeter Wallpapers: http://quidsup.net/?i=twist-in-time http://quidsup.net/?i=mysterious_black_angel http://quidsup.net/?i=BlueLogo-By-Quids