Ubuntu uses by default as a login experience the Unity greeter, a greeter that provides a good-looking accessible login screen with fancy animations and eyecandy elements.
At the moment, Precise's Unity greeter, when on entering the password, plays (the default behavior) a sound (the "ready sound", sound that acts as an attention that the greeter is ready to receive passwords, change users, etc), that can be perceived, by various users, as inappropriate.
A new updated version of Unity greeter has landed in Precise Pangolin, adding extra configuration options, such as the ability to enable/disable the play ready sound via the dconf-editor:
- install dconf-editor
sudo apt-get install dconf-tools
- navigate to