????????使用GPU经常会到要使用nivida-docker2的情况，网上吧老有些不负责人的给安装步骤造成误导，不能一次成功，现将自己一次成功的经验分享如下：
1、安装docker（command by command）
# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl gnupg
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg
# Add the repository to Apt sources:
echo \
? "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
? $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
? sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
2、安装nvidia-docker2（comand by command)
distribution=$(. /etc/os-release;echo $ID$VERSION_ID) \
?? && curl -s -L https://nvidia.github.io/nvidia-docker/gpgkey | sudo apt-key add - \
?? && curl -s -L https://nvidia.github.io/nvidia-docker/$distribution/nvidia-docker.list | sudo tee /etc/apt/sources.list.d/nvidia-docker.list
sudo apt-get update
sudo apt-get install -y nvidia-docker2
sudo systemctl restart docker