Use the solution that I've mentioned earlier:
sudo -u gdm dbus-launch gconftool-2 --set /apps/gdm/simple-greeter/settings-manager-plugins/sound/active --type bool false
or:
sudo -u gdm dbus-launch gconftool-2 --set /desktop/gnome/sound/event_sounds --type bool false
The second one will disable sounds for the GDM user so it will not be changed by updates of GDM. It works for me.
Use the solution that I've mentioned earlier:
sudo -u gdm dbus-launch gconftool-2 --set /apps/gdm/ simple- greeter/ settings- manager- plugins/ sound/active --type bool false
or:
sudo -u gdm dbus-launch gconftool-2 --set /desktop/ gnome/sound/ event_sounds --type bool false
The second one will disable sounds for the GDM user so it will not be changed by updates of GDM. It works for me.