I need an Ubuntu installation that I can be 100% certain has no root kits etc. Unfortunately, buying the CDs on the Ubuntu store would cost me roughly $25 plus shipping and handling (pretty steep for a free OS).
But if I download it to my desktop, I can't be 100% sure that it will not be compromised because I can't be 100% sure that my desktop is not compromised (I'm roughly 95% sure my desktop is clean).
Am I overlooking an obvious way to achieve this result?
(It seems to me there should be a way to buy a single LTS CD for a couple dollars so that people can start fresh with an installation they know is uncompromised.)