/usr/share/glib-2.0/schemas/95_mario-myset.gschema.override

# link in /usr/share/glib-2.0/schemas/
# sudo ln -st /usr/share/glib-2.0/schemas/ /home/sysop/myScripts/supporto/95_mario-myset.gschema.override

#comando per aggiornare
# sudo glib-compile-schemas /usr/share/glib-2.0/schemas/

# https://wiki.ubuntu.com/LightDM

[com.canonical.unity-greeter]
    draw-user-backgrounds=false
    hidden-users=['sysop','mario.q']
    draw-grid=true
    background='/usr/share/backgrounds/Ubuntu-Peace_1600x1200.jpg'
    #background='#0040ff'