To install Docker on Ubuntu, do the following:

1. Update the lists.

   sudo apt-get update

   
   

2. Install the packages to use the repository via HTTPS

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

   
   

3. Add the official Docker GPG key.

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

   
   

4. Set up the repository:

   1. for x86_64 / amd64 architecture:

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

      
      

   2. for armhf architecture:

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

      
      

5. Update the lists.

   sudo apt-get update

   
   

6. Install the docker-ce.

   sudo apt-get install docker-ce

   
   

7. Check the current version of docker-compose and upgrade it to the latest version, if necessary.

   sudo curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose

   
   

8. Set the access permissions.

   sudo chmod +x /usr/local/bin/docker-compose

   
   

9. Check the installation and version of docker-compose.

   docker-compose --version

   
   

10. Add the user to Docker.

    sudo usermod -aG docker user

    
    

11. Install the Mercurial.

    sudo apt-get install mercurial

    
    

12. Add to the hgrc file

    sudo nano ~/.hgrc

    the following:

    [ui] tls = False

    
    

13. Clone the repository.

    hg clone https://bitbucket.org/Axxonsoft/axxonnext.docker /home/pc/axxonnext.docker

    
    

14. Update the repository if necessary.

    cd axxonnext.docker hg pull -u

    
    

15. Restart the OS.

    sudo reboot