Ubuntu 20.04 安装NVIDIA+CUDA+CuDnn

如果之前安装过其他版本的驱动，需要先去除

# removing ALL nvidia software
$ sudo apt-get purge nvidia* 

# Checking what's left:
$ dpkg -l | grep nvidia
# Then I deleted the ones that showed up (mostly libnvidia-* but also xserver-xorg-video-nvidia-xxx`)
$ sudo apt-get purge libnvidia* xserver-xorg-video-nvidia-440 
$ sudo apt autoremove # clean it up

安装新驱动

# now reinstall everything including nvidia-common
$ sudo apt-get install nvidia-common

# find the right driver again
$ sudo add-apt-repository ppa:graphics-drivers/ppa
$ sudo apt update
$ ubuntu-drivers devices
$ sudo apt-get install nvidia-driver-440 # the recommended one by ubuntu-drivers
$ update-initramfs -u # needed to do this so rebooting wouldn't lose configuration I think

$ sudo reboot 

重启之后检测：

nvidia-smi

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安装Cuda

首先获取密钥