ubuntu18.04安装docker

sudo apt update
sudo apt install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
sudo apt update
sudo apt-cache policy docker-ce
sudo apt install docker-ce
sudo systemctl start docker
sudo systemctl enable docker
sudo usermod -aG docker $USER
sudo chown "$USER":"$USER" /home/$USER/.docker -R
sudo chmod g+rwx "/home/$USER/.docker" -R
cat /etc/group ｜ grep docker
groupadd docker
sudo gpasswd -a $USER docker