Instalando o Docker

Atualize

sudo apt update

Pacotes requeridos:

sudo apt install apt-transport-https ca-certificates curl gnupg2 software-properties-common

GPG key oficial Docker repositório:

sudo curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -

APT sources:

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"

Atualize novamente

sudo apt update

sudo apt-cache policy docker-ce

sudo apt install docker-ce

sudo systemctl status docker

adduser user1 or useradd user1
usermod -aG docker user1
su - user1
id -nG