The recommendation on Linux is to install Calibre from the website not your distribution's repositories. A) because Calibre in the distribution repo is usually heavily outdated and B) because Calibre comes with its own Python and modules bundled and all plugins (including mine) are usually "tuned" to these modules and versions, not the ones Debian decides to include.
Can you try removing Calibre, install it again from the website and see if that helps?
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