I could never get my nvidia drivers working in Ubuntu and co. Whenever I installed the module, and ran the xconfig tool to change from the "nv" driver to "nvidia", it would crash next boot. I thought this might be the same for Debian, but not so. Debian-nVidia HOWTO - Installation using a tool called module-assisstant the kernel module source was compiled, and after issuing a few commands and restarting X I had 3d acceleration. If anyone has had problem then try the steps here: Debian-nVidia HOWTO - Installation
With the nvidia driver enabled, following the instructions I would get the Ubuntu loading screen but nothing would happen.
I didn't have any problems installing them in Debian either, using the following method: Make sure kernel headers are installed and match running kernel. Download drivers from NVidia. init 1 (in debian, goes to a maintenence runlevel) install drivers using --x-module-path=/usr/lib/xorg/modules/ argument init 3 (go back to graphical runlevel) Afterwords, you can check for direct rendering with the following: Code: glxinfo | grep render