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 books, click "Show details" for more information. Worker process crashed while executing job Traceback (most recent call last): File "/usr/lib/calibre/calibre/utils/ipc/pool.py", line 103, in recv result = cPickle.loads(eintr_retry_call(self.conn.recv_bytes)) File "/usr/lib/calibre/calibre/utils/ipc/__init__.py", line 19, in eintr_retry_call return func(*args, **kwargs) EOFError -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1449608 Title: Cannot add new epubs to a library To manage notifications about this bug go to: https://bugs.launchpad.net/hundredpapercuts/+bug/1449608/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs