I downloaded 700MB of kubuntu Linux distro and tried installing it on my machine. Well, the CD booted up and I was able to use Linux without writing anything on the hard disk. The GUI worked without any issues.

Satisfied with this, I tried installing it over my old Ubuntu Linux. But the installation got stuck and it also corrupted the GRUB loader . Now, I am not able able to log on to Windows as well 🙁

May be, kubuntu is not for human beings.