nvidia-smi报错（重装Nvidia驱动）
遇到一个莫名其妙的问题：
NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.
解决方案：重装NVIDIA驱动（非cuda）
首先在官网下载你自己显卡对应的驱动NVIDIA-Linux-x86_64-xxx.xx.run，拷贝到Linux某个目录后先改权限
chomod 777 NVIDIA-Linux-x86_64-xxx.xx.run 1
卸载原驱动
sudo apt-get remove --purge nvidia* # 提示有残留可以接 sudo apt autoremove 1
临时关闭显示服务
sudo service lightdm stop 1
运行安装程序
sudo ./NVIDIA-Linux-x86_64-375.66.run
安装后再重启显示
sudo service lightdm start
