You made my point for me. 99.9% of SHIPPED SYSTEMS with Windows installed WILL just work (at least at first), because the hardware was chosen for the OS, the drivers selected and added to the installation CDs, and the OS configured for the hardware.
Then you said "If I installed kubuntu on all of those machines, simply everything would not work.", but Kubuntu wasn't configured for the hardware. YOU installed Kubuntu on those machines, but you expect that it will work as flawlessly out of the box as the pre-installed Windows on the same machine?
It might be just me, but I could never get Windows rollback to work properly. Then again I wouldn't have a clue how to use Linux recovery mode either.
Then, as I said, Windows will work, pre-installed, out of the box...but give it six months and installing and uninstalling software, changing/adding hardware etc, and see if it works as well as Linux does after six months. I've had Ubuntu on my notebook for going on 2 years, and it works as well now as it did then, upgraded from Hoary to Breezy to Dapper. This after 6 months of XP on a brand new HP laptop almost ground to a halt.
And the wireless and video worked "out of the box", as soon as I'd installed Ubuntu, as did the touchpad, sound, etc.
Comparing Windows, pre-installed on hardware configured for Windows, with Kubuntu installed by you on hardware configured for Windows, is like comparing apples with oranges and unfair. Buy hardware that supports/is supported by Ubuntu/Linux, or have Linux pre-installed on hardware configured for Linux, then do the comparison.
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