[theandrewbailey]

There are no KDE apps or libraries in Xubuntu. I'm pretty sure that I would have noticed in the 10 years of using Xubuntu and updating it with Synaptic.

[ktpsns]

Technically, that's not correct: Xubuntu is just an ubuntu package (https://packages.ubuntu.com/disco/xubuntu-desktop). You can install any other Ubuntu (Debian) packages.