Guess what. I have tried now (deleted and reimported a PDF book) and it has worked. It read the metadata and the cover too (and it takes a loooooong time).
I wonder... When I first tried I hadn't yet installed poppler (since "pdfinfo" was "command not found"), but ebook-meta worked and it was then when I got the Unknown authors. Now I have poppler installed, and the metadata has been read. Could that be the reason?
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