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dba901fb0 - FWIW: the folder for a new library must be empty.
Some Linux file dialogues don't play well with calibre, you can overcome that by setting the CALIBRE_NO_NATIVE_FILEDIALOGS environment variable, see ==>>
https://manual.calibre-ebook.com/cus...ment-variables.
Or you could install the latest version of calibre from ==>>
https://calibre-ebook.com/download_linux
BR