Oh! man thanks a lot, you saved my life =D>
My laptop is Sony Vaio VPCCW23FX
After installing Kubuntu for 3 times, trying many different ways to install Nvidia drivers, I got it to work.
One thing is that for those my need to install build-essential and linux-headers which are required to install the nvidia driver
Now time to check what else worksCode:sudo apt-get build-essential linux-headers-`uname -r`