Including the ATmega328PB as a further Nano variant

Community Suggestions for the Arduino Project
8

In order to gather more information that might help us to troubleshoot your problem, I'm going to ask you to post the full output from the upload when in verbose mode.

Please do this:

  1. Select File > Preferences from the Arduino IDE's menus.
  2. Uncheck the checkbox next to Show verbose output during: [] compilation
  3. Check the checkbox next to Show verbose output during: [] upload.
  4. Click the OK button.
  5. Attempt an upload, as you did before.
  6. After the upload fails, copy the full text of the black console pane at the bottom of the Arduino IDE window and paste it in reply here.