I can confirm that once I installed Kubuntu 15.10 this problem no longer
occurs.
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https://bugs.launchpad.net/bugs/1449608
Title:
Cannot add new epubs to a library
To manage notificatio
I also have this issue running calibre 2.20 with Kubuntu 15.04. It is
able to add some ebooks but has failed with an epub I created with
sigil. The epub was validated and was able to be opened with calibre's
ebook-viewer program.
calibre, version 2.20.0
ERROR: Cannot add books: Failed to add some
