Comment 29 for bug 50320

There was no mistake. Kubuntu replaced kcontrol, which is KDE's configuration application and is a part of KDE's default install, with the "system settings" application, which, still up to this day, offers only a limited subset of the configuration options that is offered by kcontrol. Thanks to that decision, Kubuntu's users suddenly found themselves without any decent desktop configuration tool for nearly 2 years, which caused a few problems like the one portrayed in this bug report.

Granted, the system settings application is in fact easier on the eyes. Nonetheless, pretty doesn't mean squat if the user suddenly finds himself incapable of doing anything.