1. remove old docker installations

sudo snap remove docker --purge
sudo apt-get remove docker
sudo apt-get remove docker-engine
sudo apt-get remove docker.io
sudo apt-get remove containerd
sudo apt-get remove runc

2. install dependencies

sudo apt-get update
sudo apt-get install ca-certificates curl gnupg lsb-release

3. add gpg key

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

4. add repository

echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

5. install docker

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin

6. install nvidia docker (for gpu use)

distribution=$(. /etc/os-release;echo $ID$VERSION_ID) \ && curl -fsSL https://nvidia.github.io/libnvidia-container/gpgkey | sudo gpg --dearmor -o /usr/share/keyrings/nvidia-container-toolkit-keyring.gpg \ && curl -s -L https://nvidia.github.io/libnvidia-container/$distribution/libnvidia-container.list | \ sed 's#deb https://#deb [signed-by=/usr/share/keyrings/nvidia-container-toolkit-keyring.gpg] https://#g' | \ sudo tee /etc/apt/sources.list.d/nvidia-container-toolkit.list
sudo apt-get update
sudo apt-get install -y nvidia-docker2
sudo systemctl restart docker

7. in case of retrieving gpg error time out while building image

put keyserver keys.openpgp.org into ~/.gnupg/gpg.conf.

Docker Commands

1. list containers

docker ps -a

2. delete all stopped containers

docker container prune

3. delete all dangling images (images that are not tagged or referenced by any container)

docker image prune

4. delete all images that are not used by existing containers

docker image prune -a