I'm currently running Ubuntu 16.04 LTS. I decided to try out KDE Plasma after using it in a VM and being pretty happy with it. Unfortunately, when I switch over in my main Ubuntu installation, through running
apt install kubuntu-desktop, I end up with really tall and goofy looking window titlebars:
Update Also - window titles themselves are odd. Configuring settings for the breeze theme sets the title to "org.kde.breeze - SystemSettings"