Maybe uninstall 3.5.16 through synaptic?or follow the directions on the page I linked to (you say "I tried that" but these directions don't mention synaptic at all, so I'm confused what you actually did)?
i'm trying to set up kde on a new desktop and ii have a question or two. the calendar pkg called "synaptic" is one that i had on an older gnome desktop. i used synaptic rather than apt-get because it required less typing and i am disabled. Can anybody point me at the kde equiv of synaptic. Lastly--this post!--the default font is TINY.