A temporary solution here is to uninstall the Ubuntu package and use the binary provided by the developer: this allowed me to import the EPUBs correctly. https://bugs.launchpad.net/calibre/+bug/1493627
My error output is the same as others with the ubuntu package on Ubuntu GNOME 15.04. -- You received this bug notification because you are a member of Edubuntu Bugsquad, which is subscribed to calibre in 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 _______________________________________________ Mailing list: https://launchpad.net/~edubuntu-bugs Post to : [email protected] Unsubscribe : https://launchpad.net/~edubuntu-bugs More help : https://help.launchpad.net/ListHelp

