解决 NVIDIA-SMI has failed because it couldn‘t communicate with the NVIDIA driver.

错误：

NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. 
Make sure that the latest NVIDIA driver is installed and running.

 

情况：

•         CUDA：确实装过
•          nvcc -V :有信息出现

 

解决：

      1）查询当前使用的 nvidia 驱动 版本号

ls /usr/src | grep nvidia

#假如 输出是 nvidia-450.57

      2）安装相关工具

sudo apt install dkms

      3）重新安装驱动

sudo dkms install -m nvidia -v 450.57