How to Disable Ubuntu Login Sound

Sometime, Ubuntu login sound makes us difficult to turn on our PC when we are in conference room, meeting room, class room and so on. Because all of the people will notice us, if our Ubuntu login sound will come out loudly. This tutorial post is intended to disable login sound on your Ubuntu. Here is how to disable your Ubuntu Login sound.
Open terminal, and copy and paste the following command to your terminal:

gksudo gedit /usr/share/gnome/autostart/libcanberra-login-sound.desktop

Go at the bottom of the file and set NoDisplay=false. Then, save this file. Open the Startup Applications . Deslect the Gone Login Sound in the following screenshot.