mute drum sound before Ubuntu login

If you tried all the HowTos but no one really solved that annoying drum sound before login, you can try my solution (tested on Ubuntu 10.10):

• open a terminal and copy-paste the following command: sudo gedit /usr/share/gdm/autostart/LoginWindow/libcanberra-ready-sound.desktop
• comment the line which begins with "Exec=" by adding a # at the beginning of the line
• save, quit, and at next restart you won't have the login sound.