I can confirm that this is an error only with the Ubuntu 15.04 package.
Removing the Ubuntu package and installing the binary from the above
link works for importing EPUB files.
** Also affects: calibre (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: calibre (Ubuntu)
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https://bugs.launchpad.net/bugs/1493627
Title:
ePub files not adding to Calibre library Ubuntu 15.04 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 : EOFError
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