Annoying system beep under Xubuntu 8.10

If you face a problem of getting an annoying system beep at startup / shutdow and any other actions under xubuntu 8.10, the only solution is to blacklist the pcspkr module.

edit the /etc/modprobe.d/blacklist file as root (sudo) and add line,

blacklist pcspkr

Although the changes will apply only after you reboot the machine, you can do

sudo modprobe -r pcspkr

This will remove the pcspkr module and disable the annoying sound