Windows 10 Installation Has Failed

Today, trying to upgrade my Windows 10 Pro machine to 1903 from a USB drive, I received this most unhelpful message:  “Windows 10 Installation has failed”:

Win10 install failure

No error code, no indication where to look for log files, no “sorry,” nothing.

If you get that, check this file for the error codes and messages:

C:\$WINDOWS.~BT\Sources\Panther\setuperr.log

In my case, I learned that a certain file on my newly-created USB media could not be copied. I’m re-creating the media.

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