graeme_p - 9:49 am on Dec 20, 2012 (gmt 0)
In comparison to anything Microsoft offer, both the OS and the CPU will be cheaper if they run something like Linux.
Windows licences are cheap for manufacturers. I do not see how it makes a difference to CPU cost (except where it is heavier, as another poster said).
There is another thread complaining about Ubuntu 12.04, and other people seem to have run into a lot of problems with broken packages.