Uploading to UNO R3 fails: "exit status 1"

Development Tools Uploading
2

Hi @danlindsay90.

I'm going to ask you to post the full verbose output from an upload attempt.

:exclamation: This procedure is not intended to solve the problem. The purpose is to gather more information.

Please do this:

  1. Select File > Preferences... (or Arduino IDE > Settings... for macOS users) from the Arduino IDE menus.
    The "Preferences" dialog will open.
  2. Uncheck the box next to Show verbose output during: ☑ compilation in the "Preferences" dialog.
  3. Check the box next to Show verbose output during: ☐ upload.
  4. Click the "OK" button.
  5. Attempt an upload, as you did before.
  6. Wait for the upload to fail.
  7. You will see a "Upload error: ..." notification at the bottom right corner of the Arduino IDE window. Click the "COPY ERROR MESSAGES" button on that notification.
  8. Open a forum reply here by clicking the "Reply" button.
  9. Click the <CODE/> icon on the post composer toolbar.
    This will add the forum's code block markup (```) to your reply to make sure the error messages are correctly formatted.
    Code block icon on toolbar
  10. Press the Ctrl+V keyboard shortcut (Command+V for macOS users).
    This will paste the error output from the upload into the code block.
  11. Move the cursor outside of the code block markup before you add any additional text to your reply.
  12. Click the "Reply" button to post the output.

The "exit status 1" error you noticed is only a generic code that tells us something went wrong, but nothing about what went wrong. There are a huge number of possible unrelated different problems that could cause an upload to exit with status code 1.

The cause in the case of the topic you are referencing happened to be very specific to the ESP32-S2 microcontroller on the board they were using. Since your Uno R3 board doesn't use that microcontroller, the cause of the upload failure you are experiencing is something completely different.