Since the default slh kernel in aptosid dropped needed BKL header files for building the proprietary nvidia kernel driver, it will be necessary to use an alternative until nvidia decides to offer rebuilt linux drivers.
# echo "deb http://frickelplatz.de/debian/ sid main contrib non-free" >> /etc/apt/sources.list.d/frickel.list # apt-get update
Search for installed Kernel.
# dpkg -l|grep linux-image
and remove the meta packages for slh (aptosid)
# apt-get remove linux-headers-2.6-aptosid-amd64 linux-image-2.6-aptosid-amd64
Meanwhile, install the new meta package in order to allow d-u to happen in the future on those too.
# apt-get install linux-image-2.6-frickel-amd64 linux-headers-2.6-frickel-amd64
Reboot into the new kernel, and run smxi again, skip to graphics install and let the nvidia install rebuild/reinstall the kernel module.
After reboot, you can also run the d-u then.