The only way this can possibly happen is if the calibre library is on a broken filesystem such as a network share or a folder shared using a file sync service such as dropbox/gdrive/etc.
Move your calibre library to a correctly functioning ext4 filesystem that is not modified by programs other than calibre and you will be fine. https://manual.calibre-ebook.com/faq.html#i-am-getting-errors-with-my- calibre-library-on-a-networked-drive-nas ** Changed in: calibre Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1758548 Title: Changing title or author to uppercase/lowercase causes book to disappear (French Language) To manage notifications about this bug go to: https://bugs.launchpad.net/calibre/+bug/1758548/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
