Re: 256-series drivers won't install on Kubuntu with 2.6.32-24 kerenel (AMD64)
I'll try doing that over the weekend. What I did for now -- and yes, I know the risks of doing so -- was to temporarily rename /usr/src/linux-headers-2.6.32-24 out of the way and then made a symlink so that 2.6.32-23 stood in for it. Works fine. So there is definitely some difference between the headers that is causing several of the conftest.sh tests to fail.
It is odd that no one else is reporting this, yet the fact that I can install on an older kernel makes me think it is NOT related to my specific setup.