ubuntu16.04安装NVIDIA显卡驱动

1.开始从官网上下载了.run文件进行安装，但发现一直不好使，安装后不能使用nvidia-settings来切换显卡，会一直报You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart

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