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Installing Docker on Azure (Linux) Virtual Machine

Step 1. Update the apt package index:
sudo apt-get update

Step 2. Install packages to allow apt to use a repository over HTTPS:
sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common

Step 3. Add Docker’s official GPG key:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Step 4. Set up the stable repository (command depends on system architecture):
sudo add-apt-repository \
    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
    $(lsb_release -cs) \
    stable"

Step 5. Update the package index again:
sudo apt-get update

Step 6. Install the docker-ce package (the service should start automatically after installation):
sudo apt-get install docker-ce

Step 7. Verify that docker installed properlty:
sudo docker run hello-world
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