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Most probably you don't have the rights to open the port. You can easily check with the following command od /dev/ttyACM0. If this does not work, but works with sudo od /dev/ttyACM0, this is the reason.

You need to add yourself to the dialout group: sudo adduser <YOUR_USERNAME> dialout, log out and log back in. Check if you really are in the dialout group by checking the output of groups. This should get you access.

Please report back if this does not solve the issues, preferably with any additional details.

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