Using lightdm, the wallpaper that is shown is usually the one used by the selected user. If you want to change this or just set a static wallpaper for your login screen, there are a few possibilities to do that.
If you install lightdm on distributions other than Ubuntu you may want to have the Ubuntu logo in the lower left corner removed or altered. This can be done easily by editing the original picture file which is located in
Ubuntu's login manager, lightdm, offers a guest login option by default. Most of you won't use it anyway, so why keep it at all? You can disable that entry in the lightdm configuration file, which is /etc/lightdm/lightdm.conf. Open it from
Version 13 of Linux Mint (Maya) uses the MDM login manager that requires you to enter the username of the user you want to log in to in addition to your password which might annoy a few people. Although it
If you want to make your Ubuntu installation a little less purple and orange, but don't see a solution that covers the change of log-in screen background picture change, try Simple Lightdm Manager. It is a tool that lets you