Déconnecte / reconnecte l'ARDUINO.
Tape le commande suivante :
dmesg
[10183.787416] usb 2-1.1.2: Product: USB2.0-Serial
[10183.787812] ch341 2-1.1.2:1.0: ch341-uart converter detected
[10183.789511] usb 2-1.1.2: ch341-uart converter now attached to ttyUSB0