Ubuntu18.04LTS左上角光标闪烁原因之一：NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver.

1.Ubuntu18.04在安装lightdm之后重启后出现黑屏，光标左上角闪烁

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

3.重装显卡驱动然后重新进入桌面就行了

sudo sh NVIDIA-Linux-x86_64-440.100.run

完成重装后成功解决

最后重新进入图形界面即可

sudo init 3

sudo init 5

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原文地址：https://www.cnblogs.com/zmbreathing/p/Ubuntu_black_screen_1.html