What is Ubuntu ?

It is a linux operating system developed by a recent group of people for desktop and servers.
As claimed by the Ubuntu official wenbsite ;

Ubuntu is designed with security in mind. You get free security updates for at least 18 months on the desktop and server. With the Long Term Support (LTS) version you get three years support on the desktop, and five years on the server.

Installation takes about 30 minutes from CD .Another 25 minutes to download the CD content from the mirror location to the laptop and copy it to your RW CD.

Other softwares are available online by accessing the operating system itself.
apt-install

Why I switched to Linux after 8 yrs of use with Windows?
Many reasons will fill up on that with detail on weekend

Installation of KDE

Currently am working to get the installation on my Mac machine
running.I will just put in the steps I have done so far

1.Installation of JVM JamVM - Tested and working

2.Installation of Konqueror web browser - Apparently , this required
setting up of the KDE environment from the link

http://www.kde.org/download/

So the essential libraries (being in order of configuration)
a) arts-1.5.9
b) kdelibs-4.0.3
c) kdebase-4.0.3 ,kdebase-runtime-4.0.3 , kdebase-workspace-4.0.3

3.While installing arts-1.5.9 configuration stops with error message

checking for Qt... configure: error: Qt (>= Qt 3.3 and < 4.0) (headers
and libraries) not found. Please check your installation!
For more details about this problem, look at the end of config.log.

So I download Qt from link

http://trolltech.com/downloads/opensource

Qt Open Source Edition for C++ Developers (for Mac Download)
After complete
./configure
make
make install

I get the same error on installing arts-1.5.9
Looking itno it currently