I vividly remember the beep in 9.04 when I shutdown the computer

sudo shutdown -h now

and I will hear a "DI"/"Bee" sound

sudo shutdown -h +5

and I will hear 5 beeps every minute till it is power off

The beep is a great warning for me and I really need this feature

however,I tried many approach to recover it in 9.10 but failed

now 10.04 is coming soon,I guess it also won't have this feature.

Can someone help me ?

thx a lot