Often i turn on my pc during lessons or talks and the ubuntu login sound makes the whole process not discrete and make people notice i’m in that room. This is likely a side effect you wouldn’t like to happen, like me. So here is how i removed the ubuntu login sound on my ubuntu 11.10 Oneiric.

Open a terminal (open unity an look for terminal) and then paste this command:

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

Go at the bottom of the file and set NoDisplay=false. Save the file and then go to the power button in the top-right part of the screen, the one closer to your username. Then select Startup Applications… . You will find the ubuntu login sound in the menu. You can now select or deselect as you wish like in the following figure.