Arduino Uno rejects uploads, changes ports


After experimenting with some Serial communication (which may or may not be relevant), the Arduino IDE throws a “Error opening serial port” error when I try to upload new code to the Arduino or use Serial Monitor. This has happened in both Windows and Linux.

In Linux, after a failed upload I tried disconnecting, then reconnecting the board. It was reassigned to the next open serial port. For example, it starts out as /dev/ttyACM0, then moves to /dev/ttyACM1, and so on.

When plugged in, the “TX” LED lights up, then goes dark. When I try to upload to it, the “TX” LED flickers twice, then nothing.

Any ideas?

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check the baudrate it should be 9600,You can check the baudrate in preferences.txt file.