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I installed the latest Arduino IDE (version 1.8), but I'm still getting the Could not find USBtiny device (0x1781/0xc9f) error. I'm using Ubuntu 16.04 LTS and have followed all the steps on this page: https://learn.adafruit.com/adafruit-arduino-ide-se...Do you think I should revert back to version 1.6? It doesn't seem like that should be an issue, but I'm not sure what the next troubleshooting step should be. Thanks.