I've not used my Arduino for about 2 months. Before this time it worked fine, but now when I want to upload my program I get this error:
Couldn't find a Board on the selected port. Check that you have the correct port selected. If it is correct, try pressing the board's reset button after initiating the upload.
I reset immediately after uploading but it doesn't work.What else should I do? I'm using Ubuntu and the Arduino IDE.