I have an Uno R1 with the 8u2 interface chip, and an Uno R3 with the 16u2. I was having problems connecting to the R1 over the serial port, and found that /dev/ttyACM0 wasn't created when it was plugged in. After a lot of trouble-shooting (it was seen on the USB ehci bus, but nothing was created/l…

Uno R1 doesn't work on Linux; Uno R3 works

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