Enable or disable the sound boot in Ubuntu 12.04

As you noticed, we indicate the start of the Ubuntu operating system through a simple melody for years remained the same for every release.
will find the new version 12.04 Precise a whole new sound boot chosen through a contest conducted by Canonical Design team and is still disabled by

default.
However, we can very easily enable or disable the sound boot in Ubuntu 12.04 Precise LTS through a few simple steps. Here's how:

For enable or disable the sound boot of Ubuntu 12.04 just click the gear icon at the far right panel and click on Applications boot.

At this point, just check or remove the selection from GNOME Login Sound and close the window.
At the next boot will boot the sound on or off in accordance with our preferences.