Comment 3 for bug 282954

I'd like to have this, too. In fact, I think the installed system should, by default, be silent. Computers should be quiet unless told to make noise.

There are all sorts of situations in which it is a real bother that Ubuntu systems make noises by default. And other computers, too. I've been woken up several times on long flights by the Windows login sound, for example, when other people decide to do some work when they can't sleep.