Has anyone noticed issues during and/or after the installation of KDE desktop?
sudo apt-get install kubuntu-desktop
I already have Gnome Shell along with Unity but want to add KDE for testing purposes. I heard somewhere that in Ubuntu 11.10, it does not go smoothly.
I don't know what you heard/read but it works just fine. Kubuntu is built on the same base as Ubuntu, uses the same libraries etc, just that KDE and it's related libraries+programs provide the desktop environment.
In fact, I have it installed (Kubuntu-desktop) on two systems with no problems...