I was having no problems uploading sketches to my 2 uno boards for a while, then one day, I couldn't get anything to upload. I was still using the 1.6 IDE at the time so my first step was to upgrade to 1.8, but that didn't fix anything. I have also tried a third, brand new, board with no success. I …

Cannot upload any sketches to any boards - "Serial Port" menu is greyed out

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