Just what sort of problems would doing the above command lead to. I have installed kde desktop and would like a pure kde DE. I understand theres kubuntu but I've done so much with this one now that I'd be loathe to do it all again.
It would remove the Unity desktop environment itself, so that when you log in, the Unity session option will no longer be available. If you will never use Unity, there should be no problem.
Be aware that there are many dependencies of
unity that may not automatically be removed. To save disk space, you could also uninstall them. When doing so, remember to check before hitting Enter to make sure that
apt-get isn't trying to uninstall half your system.
A few Unity-related things you probably should leave:
libunity9 (many GNOME applications depend on this).
Assuming you are already using the KDE login screen (which is separate from the default Ubuntu one), you can also remove