Does KPackageKit still exist? It is not in the openSUSE repos, nor on kde-apps.org, and I can't find it in /branches/stable/l10n-kde4/da/messages which probably means, that there are no interface strings for it (it has been translated previously).
I believe that Apper is the new KPackageKit, but its interface is not identical. Also, as far as I can tell, the default package manager in Kubuntu since 11.10 is Muon.
KDE UserBase Wiki 