Maintainers for libkdesu5 are Debian/Kubuntu Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>.
You may want to refer to the following packages that are part of the same source: kdelibs-bin, kdelibs5-data, kdelibs5-dev, kdelibs5-plugins, kdoctools, libkcmutils4, libkde3support4, libkdeclarative5, libkdecore5, libkdeui5, libkdewebkit5, libkdnssd4, libkemoticons4, libkfile4, libkhtml5, libkidletime4, libkimproxy4, libkio5, libkjsapi4, libkjsembed4, libkmediaplayer4, libknewstuff2-4, libknewstuff3-4, libknotifyconfig4, libkntlm4, libkparts4, libkprintutils4, libkpty4, libkrosscore4, libkrossui4, libktexteditor4, libkunitconversion4, libkutils4, libplasma3, libsolid4, libthreadweaver4.
You might like to refer to the libkdesu5 package page, to the Package Tracking System, or to the source package src:kde4libs's bug page.
If you find a bug not listed here, please report it.