error message in DrRacket

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Albert Wagner

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Oct 8, 2020, 8:22:09 PM10/8/20
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Clicking on DrRacket->Help->Racket Documentation yields this error message:

browser-run: process execute failed: '("file:///usr/racket/doc/index.html")
/bin/sh: 1: file:///usr/racket/doc/index.html: not found

When that URL is manually entered into my browser it properly brings up "Racket Documentation", but I don't know why, because there is no such directory on my computer,i.e, /usr/racket/doc exists, but /usr/racket/doc/ contains neither a file nor directory named index.html.  Actually, /usr/racket/doc displays:
"Index of file:///usr/racket/doc"

I am on Ubuntu 20.04
Racket 7.8 installed in /usr

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