Editez le fichier /etc/X11/xorg.conf

Section "InputDevice"
       Identifier      "Generic Keyboard"
       Driver          "kbd"
       Option          "CoreKeyboard"
       Option          "XkbRules"      "xorg"
       Option          "XkbModel"      "pc105"
       Option          "XkbLayout"     "fr"
       Option          "XkbOptions"    "lv3:enter_switch,apple:goodmap,numpad:mac"
EndSection

Ensuite redémmarrer le serveur X