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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