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• If there is ever permission problem when uploading codes for Arduino when using Linux.
• The problem might be becase the permission to accessing serial connection is not set properly.
• The solution then to include the current user into "dialout" group. Check the screenshot in bottomost of this note for the explanation and the solution.
• Here is the link of the discussion from Ubuntu StackOverflow, http://askubuntu.com/questions/210177/serial-port-terminal-cannot-open-dev-ttys0-permission-denied.
• Here is the screenshot to the discussion.