There are times when you may not want ubuntu to make a loud sound just in case your computer is common room and you don’t want to disturb others or you may not want to hear the booting sound in ubuntu while booting it. When it comes to login screen sound, we already write a tutorial to mute ubuntu login sound but in order to make ubuntu silent while booting follow the procedure given below.
1. Start ubuntu and go to sound preferences as shown in the image below
2. Under Sound Preferences – Click Sound Effects and then select No sounds under sound theme as shown in the image below.
3. Now Go to System -> Preferences -> Starup Applications Look for “GNOME Login Sound” in the list. If you don’t want to hear anything at startup, uncheck this box – option to uncheck shown in the image below