Source : https://www.shuto.fr/configuration-clavier-mac-sous-debian/
sudo nano /etc/default/keyboard
# KEYBOARD CONFIGURATION FILE
# Consult the keyboard(5) manual page.
XKBMODEL="pc105"
XKBLAYOUT="fr"
XKBVARIANT="mac"
XKBOPTIONS="lv3:switch,compose:lwin”
BACKSPACE="guess"