Hey I want best of all worlds and hence I want that i have Kubuntu,edubuntu Xubuntu etc in my single ubuntu installation can someone please help??
Assuming you have installed Ubuntu, in a terminal, do
sudo apt-get install kubuntu-desktop xubuntu-desktop mythbuntu-desktop edubuntu-desktop lubuntu-desktop
(or install these packages using Software Centre or Synaptic.)
Log out. At the login screen you should be able to choose the desktop environment of your choice. I'm not sure if each of the above corresponds to a different one, though.
sudo apt-get install ubuntu-desktop kubuntu-desktop lubuntu-desktop xubuntu-desktop edubuntu-desktop mythbuntu-desktop gnome-shell
WARNING: There will be a lot of different programs that have the same purpose.