Binary package hint: gnome-control-center
I installed Intrepid fresh onto this laptop (HP Pavilion dv9540us), and the alert sounds don't play. Instead, whenever I make one of the rather common mistakes that cause an alert sound (such as hitting backspace one too many times), there's a very loud, and very annoying, beep from the internal speaker.
If I go to system->preferences->sound, where I would expect to disable the annoying beep, I find that the System Beep tab is now gone. I agree with this decision - this is 2008, we should never be using the internal speaker for anything. Especially not shutdown noises, where it's not even obvious how to disable it.
After googling, however, I found that many others have this problem, and strangely enough the solution is to click "disable alert sounds" even though the alert sound itself never plays.
So, there are two bugs here then:
1) The nice alert sound isn't used at all. I've never heard it in Ubuntu, only annoying PC speaker beeps.
2) We use the PC speaker instead of the alert sound, and disabling the PC speaker is difficult since we no longer have the system beep tab.