Let's say you have both LightDM and GDM display managers installed on your computer (running Ubuntu or any other Debian-based Linux distribution). LightDM is default but you want to switch to GDM - to do this, run the command below in a terminal:
GDM2Setup, a GUI configuration tool for the new GDM (2) is now available for Ubuntu Lucid too.
The GDM login screen in Ubuntu Karmic displays the user list by default, which is considered a security risk by many people.
Epidermis theme manager is an open source GTK application for managing, automatically downloading and installing themes of various types, in order to transform the look of your Ubuntu desktop, from the moment you turn it on until the moment you turn it off.
To install a GDM theme in Ubuntu, simply go to System > Administration > Login Window and select the tab called "Local".
Gnome-Art Next Generation is the successor of Gnome-Art and lets you change your Gnome-themes (icon-, wallpaper-, splash-,...-themes) with one click. It is in an early stage and under development but it looks very promising already.
The GNOME-Colors is a project that aims to make the GNOME desktop as elegant, consistent and colorful as possible.
Many customers, particularly those who are security conscious or those who have public terminals like to display a legal notice before users can login.