I am running kubuntu 8.04 with KDE 3.5.10. I would like to install KDE 4.2 and keep my KDE 3.5.10 as well. The last few times I tried KDE 4 I did not like it, but this was 6 months ago. I think I am ready to give KDE 4 another shot but just in case i dont like it, I can boot into KDE 3.

How do i do this?