Disable Startup Sound in Ubuntu 11.04 Natty

Sometimes when I started my notebook at night, the startup music often disturbed my family. It was time-consuming for me to find how to disable the sound, but it takes only 3 minutes to do it. Here you go.

I found that there are two pieces of sound at startup:

1. Sound for Login Screen
   
   • Go to the right-upper corner of your desktop
   • Select ‘Menu –> System –> Login Screen’ 
   • Check the option ‘Play login sound’, and close the dialog
   • Go to the dialog ‘Login Screen’ again, uncheck the option ‘Play login sound’, and close out
   
   The option ‘Play login sound’ is unchecked by default, but login screen sound is played actually, which should be a bug.
   
2. Sound after login
   
   • Go to the right-upper corner of your desktop
   • Select ‘Menu –> Preference –> Startup Applications’ 
   • Uncheck the option ‘Gnome Login Sound’, and close the dialog

The menu of your system may be a little different, but look for the two dialogs, ‘Login Screen’ and ‘Startup Applications’.

FYI, the two pieces of music are located at /usr/share/sounds/, and you can replace them with your favorites.