[racket] slideshow-latex installation problems

Trying to install slideshow-latex through raco pkg install, I got the
following error:
delete-file: cannot delete file
  path: /usr/bin/slideshow
  system error: Permission denied; errno=13

It's strange that a package would try to do that. Is this normal?

Then, I could not manage to require the package with any of the following
lines:
(require slideshow-latex)
or
(require slideshow-latex/slideshow)
or
(require slideshow-latex/slideshow/latex)

What's the correct way of writing it?

Laurent
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