No nvidia directory, can't install Toolkit, driver, etc.

Hi, hope you can bear with a complete newb here.

I just installed Ubuntu Linux and attempted to install CUDA Toolkit 4.0, in preparation for the installation of some packages in R that make use of the GPU for statistical analysis. The only reason I installed Ubuntu is because these packages are in source code and only in Linux can I get them to binary format. Otherwise I would just have stuck with Windows.

I am following the instructions in this document ( to get the Toolkit installed. On pg. 5 it says to issue the following command in order to check the status of the Nvidia driver: /usr/bin/nvidia-settings. When I do this I get an error message saying that there is no such nvidia directory! This has me both worried and stopped. I am assuming this directory should already exist

Thanks for any help you can provide.