Quote:
Calibre is the last version available in the Mint repository: Calibre 2.55.0.
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That is your first problem. Never install Calibre from anywhere except the official web site for Calibre, which is
https://calibre-ebook.com/ . Follow the special instructions for Linux.
Afterwards, uninstall any plug-in that still requires Qt4 with no provision for Qt5. You have several. Your error messages should be reduced, leaving you with only "real" problems.
DaltonST