Hello,
It seems as though several people experienced the same problems that I encountered when I attempted to set up my Arduino DUE. Hopefully these steps will ease the set up for others.
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Verify that you have a USB cable with data transmission. Some are charge only.
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Go to Tools, Board, Boards Manager and add the Arduino DUE.
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After adding the Arduino DUE then select Arduino DUE (Programming Port) from the board list.
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Libraries must be installed with the board set to: Arduino DUE (Programming Port).
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The LiquidCrystal_IC2 display needs only the LiquidCrystal_IC2 library installed and the right address & connection (0X27, 5V, GND, SDA, SCL)
It Works !