How to enable Cuda 4.0 on Ubuntu 11.04? Cuda 4.0 on Ubuntu 11.04

Hi, all:

How to install Cuda on Ubuntu 11.04?
I grabbed nvidia-common, nvidia-current, nvidia-cg-toolkit directly from Ubuntu 11.04’s repository.
I think these are just nvidia drivers, version 270.41.06-0ubuntu1 .
Current most recent nvidia drivers version is 270.41.19 .

Hence, I didn’t replace the default driver 270.41.06 from Ubuntu repository by the new 270.41.19 .
And I directly downloaded and extracted GPU Computing SDK, say, “gpucomputingsdk_4.0.17_linux” .

However, does that mean I successfully installed Cuda 4.0 ??

I tried http://hdfpga.blogspot.com/2011/05/install-cuda-40-on-ubuntu-1104.html , but I failed to replace the nvidia driver !!!
In addition, is gcc-4.4 a must?

Best Regards
Pei

Alright, gave up installing cuda manually.

Now, following http://evilpigeons.tumblr.com/post/8382801969/the-battle-to-make-cuda-work-on-ubuntu-11-04

Rgds

Pei