How do I disable all sounds?

Solution 1:

Three simple steps:

To disable system sounds check Sound Settings:

Mute Alert Volume:

To mute the Login Sound open Startup Applications:

Disable GNOME Login Sound:

To disable the alert on the login screen (lightdm) you have to mute it once - it is muted automatically next time you start your system:

Done.

Solution 2:

Go to the Dash, type "Sound". The sound menu opens. There you can mute all system sounds.

Solution 3:

Another way to do this is to install dconf-editor (sudo apt-get install dconf-tools from the Terminal) and head over to org > gnome > desktop > sound and uncheck 'event-sounds'.