Comment 4 for bug 345672

N7DR, the bug has been resolved by no longer advertising epub support, not by including epub support unfortunately. The reason for this is, so that this package, which is in the main repository, does not depend on a package in the universe repository (see https://bugs.launchpad.net/kdegraphics/+bug/277007). A possible solution for this would be to create a new okular-extra-backends-universe package that contains epub and chmlib support (chm support was removed for the same reason - introducing a universe dependency).