Remove user list from Ubuntu 9.10 Karmic Koala login screen

Problem: You want to login to your Ubuntu laptop without letting others shoulder surf your full name. You’d like to introduce yourself to them personally instead.

Solution: In a terminal (Applications -> Accessories -> Terminal), enter

sudo -u gdm gconftool-2 --set --type boolean /apps/gdm/simple-greeter/disable_user_list true

Type in your password when requested. You’re done.