Have you tried KDE on Ubuntu? It's in such a sorry state that I consider it a wonder if it starts at all. Even trivially fixable bugs that make a package unusable for everybody go unheeded for the best part of a decade, which is presumably because Ubuntu is not run by that many people. That has been the Ubuntu way as long as I remember, but their KDE support has only gone from bad to nonexistent.
I installed (K)Ubuntu at work, and regret it. At home I run Debian unstable, which mostly just works, but breaks in all kinds of interesting ways once every two years or so. I cannot afford that at work, so I thought I'd give the hyped Ubuntu with its rolling releases a try. (Before you tell me I should try Debian stable, consider that Debian doesn't generally fix
For Ubuntu, presumably they will eventually get any KDE fixes from Debian, but for issues which for some reason happen to be present in Ubuntu but not in Debian, you are out of luck. Moreover, the KDE packages in Ubuntu seem to be essentially an entirely randomly timed snapshot of Debian unstable KDE packages. If KDE was entirely broken in Debian unstable at that point, then it will be in Ubuntu. Nobody cares.