Ubuntu: Disable the System Beep
Contributed by Rob Rogers 
Tagged: Linux If you find the System Beep to be annoying (and let’s face it, it is!), you can disable it with a simple terminal command and be system beep free.
1. Open a terminal window.
2. Execute the following command in your terminal window:sudo rmmod pcspkr
3. Close your terminal window.
Enjoy the absence of the system beep.
If you need to enable the system beep, execute the following command in a terminal window:sudo modprobe pcspk
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Wim Deblauwe said on December 18, 2008
Great recipe, always found this annoying
beep_annoyed said on April 20, 2009
Thanks!
Kleber Souza said on October 23, 2009
Thanks for the tip!
With this method you disable it only for the current session, when you reboot the system the module will be loaded again. To disable it permanently, just add the following line on the file /etc/modprobe.d/blacklist.conf:
blacklist pcspkr
And that’s it!
James Pollock said on August 31, 2010
does it also affect the PC speakers not just the system beeps?