On passe ici le système en lecture seule (trop d’erreurs).
https://hallard.me/raspberry-pi-read-only/
https://medium.com/swlh/make-your-raspberry-pi-file-system-read-only-raspbian-buster-c558694de79
https://blockdev.io/read-only-rpi/
http://blog.pi3g.com/2014/04/make-raspbian-system-read-only/