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For 12.10 (precise) if you are using Gnome's gdm (not lightdm):
None of the above works for me with gdm. If I disable the system-ready sound (the bongos), it still makes a short drum sound (one beat).
The way to disable it is:
Boot up, get into gdm.
Switch to the console (Ctrl + Alt + 1)
Logi...