Well I installed Kubuntu today and upgrade from KDE 4.1 to KDE 4.2.1 and after restarting it gives me an error just after login telling me that there is no Xsession:unable to start Xsession -no "/home/gabo/.xsession" file, no session managers, no window managers, and no terminal emulators found;...

The thing is that I'm using Kubuntu and if I try to ran "sudo apt-get install kubuntu-desktop" it tells me that there are a lot of broken packages and dependencies and it tells me that every package is not going to be installed. With "aptitude" I have a similar problem.

This is a horrible bug and it happens in every KDE desktop at the moment. It must be new package that was uploaded. It happened to me in CHAKRA but in Chakra, Plasma just crashes at login.

I want to use KDE 4.2.1 and be happy. Please I just need help.

Problem solved. It seems that you can't upgrade from a Fresh Install to KDE 4.2.1 with kubuntu experimental repos.