NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver.

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NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver.
解决办法：

　　ls /usr/src | grep nvidia 查看nvidia驱动版本号，例如418.87.00
　　sudo dkms install -m nvidia -v 418.87.00 使用dkms更新nvidia驱动
　　如果没有dkms，先使用“sudo apt-get install dkms”安装dkms