STEP BY STEP GUIDE TO INSTALL KDE 4 ON UBUNTU
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1. First step is to add the KDE 4 Repositories for doing that go to Gnome Menu -System - Administration - software sources and this APT line to the exixting repositories
"deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu gutsy main". Once you do that it will ask you to reload the list. just do that.
2. Second Step is to remove the KDE 4 Beta if you have ever installed it For doing that open a terminal window and type the following command. "sudo apt-get remove kdelibs5 kde4base-data kde4libs-data" it will ask you to type your password and then it will remove the kde 4 beta packages.
3. Third step is to install the kde 4 packages. For doing that type "sudo aptitude install kde4-core"in a terminal, again it will ask for your password and will start downloading & installing KDE 4.0 but you might recive some warnings if you have installed some KDE apps like amarok or K3B, If you recive warning just type yes and once its done installing KDE 4.o the system will automatically ask you to update those apps. Once you do that you are ready to roll.
Now Just Log out from your system and select KDE 4.0 from session and you are ready with KDE.4 . Please revert if you face any issue while installing or you have any other doubt.