Hi! I tried all that and finally see: [ 7550.048894] usb 6-2: New USB device found, idVendor=067b, idProduct=2303 [ 7550.048900] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 7550.048904] usb 6-2: Product: USB 2.0 To COM Device [ 7550.048908] usb 6-2: Manufacturer: Prolific Technology Inc. [ 7550.051758] pl2303 6-2:1.0: pl2303 converter detected [ 7550.063931] usb 6-2: pl23by PfefferMintz - RepRap Host