When I try to download the sample Blink program to my new due from the arduino IDE I get a "no device found on COM1" error. I have selected the DUE programming port under tools>board and the serial port option under tools is greyed out. I do see /dev/ttyACMO and have linked it to /dev/ttyUSB0 but that did not work. I cannot google up a solution for my problem. Can anyone give me a solution? I also have a question about which shields would fit on the DUE.