To install Docker on your Ubuntu server, follow these steps:

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Update your existing list of packages:

sudo apt-get update

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Install a few prerequisite packages which let apt use packages over HTTPS:

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

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Add the GPG key for the official Docker repository to your system:

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

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Add the Docker repository to APT sources:

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

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Update the package database with the Docker packages from the newly added repo:

sudo apt-get update

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Make sure you are about to install from the Docker repo instead of the default Ubuntu repo:

apt-cache policy docker-ce

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You should see output similar to the following, the Docker repository should be listed up top:

docker-ce:

  Installed: (none)

  Candidate: 5:20.10.6~3-0~ubuntu-focal

  Version table:

     5:20.10.6~3-0~ubuntu-focal 500

        500 https://download.docker.com/linux/ubuntu focal/stable amd64 Packages

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Finally, install Docker:

sudo apt-get install docker-ce

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Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it's running:

sudo systemctl status docker

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The output should be similar to the following, showing that the service is active and running:

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docker.service - Docker Application Container Engine

     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)

     Active: active (running) since Tue 2021-05-04 15:58:13 UTC; 2min 55s ago

TriggeredBy: ● docker.socket

       Docs: https://docs.docker.com

   Main PID: 24321 (dockerd)

      Tasks: 8

     Memory: 46.4M

     CGroup: /system.slice/docker.service

             └─24321 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

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Congratulations! Docker is now installed and running on your Ubuntu server.

sudo apt-get update

sudo apt-get upgrade

sudo apt install docker.io

systemctl start docker

systemctl enable docker

docker --version

# To install docker in ubuntu, run the following in your terminal:

​

sudo apt-get update

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

sudo apt-get update

sudo apt install docker-ce

$ curl -fsSL https://get.docker.com -o get-docker.sh

$ sudo sh get-docker.sh

​

<output truncated>

​

$ sudo apt-get remove docker docker-engine docker.io

$ sudo apt-get update

$ sudo apt install docker.io

$ sudo snap install docker

$ docker --version

curl -sSL https://get.docker.com | sudo sh

for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done

​

sudo apt-get update

sudo apt-get install ca-certificates curl

sudo install -m 0755 -d /etc/apt/keyrings

sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc

sudo chmod a+r /etc/apt/keyrings/docker.asc

​

echo \

  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] 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

## This instruction from the official website will install the latest release of docker.

​

# Uninstall old versions

# Older versions of Docker were called docker, docker.io, or docker-engine. If these are installed, uninstall them:

sudo apt remove docker docker-engine docker.io containerd runc

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# Install using the repository 

sudo apt update

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

# Add Docker’s official GPG key:

sudo mkdir -p /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

​

# Set up the repository     

echo \

  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \

  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

​

# Install Docker Engine

sudo apt-get update

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

​

# Receiving a GPG error when running apt-get update?

# Your default umask may not be set correctly, causing the public key file for the repo to not be detected. Run the following command and then try to update your repo again: sudo chmod a+r /etc/apt/keyrings/docker.gpg.

​

# Verify that Docker Engine is installed correctly by running the hello-world image

sudo docker run hello-world

#This command downloads a test image and runs it in a container. When the container runs, it prints a message and exits

​

​

# Update the apt package index

sudo apt update

​

# Install necessary packages to allow apt to use a repository over HTTPS

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

​

# Add the official Docker GPG key

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

​

# Add the Docker repository

echo "deb [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

​

# Update the apt package index with the Docker packages from the newly added repository

sudo apt update

​

# Install Docker

sudo apt install docker-ce docker-ce-cli containerd.io

​

# Verify the installation

sudo docker run hello-world

# latest and working 

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

mkdir -p /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

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

apt update

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