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I’m trying to follow the official documentation.
However, when I run the command sudo apt-get install docker-ce docker-ce-cli containerd.io

I get the following message:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package docker-ce is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'docker-ce' has no installation candidate
E: Unable to locate package docker-ce-cli
E: Unable to locate package containerd.io
E: Couldn't find any package by glob 'containerd.io'
E: Couldn't find any package by regex 'containerd.io'

Also, when running apt-cache madison docker-ce, nothing shows up in the terminal…

3

Answers


  1. use curl https://get.docker.com/ | bash - this is an automated script that will work in most of the cases

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  2. 1. Update APT:

    sudo apt-get update
    

    2. Install these packages first:

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

    3. Add GPG keys:

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

    4. Then add Docker 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. Update again:

    sudo apt-get update
    

    6. Install docker-ce, cli and containerd.io:

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

    must work – be sure to execute all commands as root or with sudo.

    You can also use their script to automate everything:

     curl -fsSL https://get.docker.com -o get-docker.sh
     sudo ./get-docker.sh
    
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  3. Install docker is pretty straightforward:

    sudo apt install docker.io
    
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