Para configurar:
sudo cp /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow
Una vez configurado:
sudo unlink /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop
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sudo cp /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow
sudo unlink /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop