Kubuntu’s default desktop environment is KDE. Sometimes people using Kubuntu want to try out Gnome as well. I need to install my kubuntu Box
sudo apt-get update && sudo apt-get install ubuntu-desktop
Wait for the packages to download
During the installation process, you should be asked whether you want to use KDM or GDM as your default display manager
my choice on GDM 
The default can always be changed later by modifying the /etc/X11/default-display-manager file. For KDM, the file should read /usr/bin/kdm; for GDM, the file should read /usr/sbin/gdm
After completion go ahead and login and
Enjoy !!!
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very useful for Linux users.