之前配过一遍都忘光了，现在要重新配一遍真是好难过。。。特此记录参考网站以便查阅。

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环境：Ubuntu 12.04+Cuda5.5

1. 判断安装环境：

The setup of CUDA development tools on a system running the appropriate version of Linux consists of a few simple steps:

• Verify the system has a CUDA-capable GPU.
• Verify the system has a supported version of Linux.

Verify the system has gcc installed.见官方配置手册：http://docs.nvidia.com/cuda/cuda-getting-started-guide-for-linux/index.html
2. 下载镜像：