Ubuntu16.04切换系统内核

1.遇到的问题 你本来已经装好显卡驱动了，然后在某次重启后：屏幕分辨率变低了；终端输入nvidia-smi，报错 NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver.Make sure that the latest NVIDIA driver is installed and running 比

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