Cannot Open Port - Permission Denied

[last updated: 2021-09-26]
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• If you connect an Arduino to your USB port, and program upload fails for "Cannot open port - Permission denied"
  This could be because you (your user) is not a member of the group that the port belongs to.

• It happens that serial ports by default belong to the "dialout" group.
  You must be a member of the dialout group in order to open any ports.

• See if you are a member of the dialout group:
  $ groups ${USER}
  This will list all groups that your user belongs to.
  If dialout is not in the list, then you must add it.
• Add yourself to the dialout group:
  $ sudo gpasswd --add ${USER} dialout

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