Install Docker on Ubuntu Linux

1. Completely uninstall Docker from Ubuntu Linux

Find what packages are installed

dpkg -l | grep -i docker

Remove Docker based on what packages were found

sudo apt-get purge -y docker-engine docker docker.io docker-ce docker-ce-cli docker-compose-plugin
sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce docker-compose-plugin

find docker

sudo find / -name "*docker*" | grep doclker

Found:

/var/lib/docker

sudo rm -rf /var/lib/docker
sudo rm -rf ~/.docker/

2. Installing Docker on Ubuntu server

sudo su -

sudo apt update -y

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

sudo apt install apparmor -y

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 focal stable"

apt-cache policy docker-ce

sudo apt update -y

sudo apt install docker-ce -y

sudo systemctl status docker

sudo systemctl enable docker

sudo systemctl start docker

sudo systemctl status docker

docker --version

sudo apt update
sudo apt upgrade -y