Ubuntu is a great desktop OS. But, in it’s default configuration, it is really annoying. It beeps constantly.
You can turn off the system beep by removing the kernel module for the PC speaker.
will@voyager:~$ sudo modprobe -r pcspkr
To make this change permanent, add this line to /etc/modprobe.d/blacklist:
blacklist pcspkr
Enjoy your new peaceful Ubuntu experience. 
