3.4 老 Nvidia 显卡安装驱动

首先安装N卡驱动检测工具：sudo apt install nvidia-detect
运行检测命令：nvidia-detect
输出示例：Detected NVIDIA GPUs:...
It is recommended to install the nvidia-legacy-340xx-driver
根据提示安装驱动：sudo apt install nvidia-legacy-340xx-driver
详见：https://wiki.deepin.org/wiki/%E6%98%BE%E5%8D%A1