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I am trying to install docker on Ubuntu 16.04. I am a complete Ubuntu newbie and only installed it recently.

Here are the installation steps: https://docs.docker.com/engine/installation/linux/ubuntu/

In order to setup the directory, I have to run this command:

bash $ sudo apt-get -y --no-install-recommends install  curl  apt-transport-https  ca-certificates  curl  software-properties-common

I am quite confused on what to copy and paste exactly.
I first copied and pasted everything from sudo:

sudo apt-get -y --no-install-recommends install  curl  apt-transport-https  ca-certificates  curl  software-properties-common

But I get the following errors:

E: Unable to locate package curl 

E: Unable to locate package apt-transport-https 

E: Unable to locate package ca-certificates 

E: Unable to locate package curl 

E: Unable to locate package software-properties-common

Do you know what those erros mean and what can I do to install Docker properly?

Thank you.

The command you entered is mostly correct, however, it suffers from a flaw: those are supposed to escape newlines, not spaces. The command in the docs is:

$ sudo apt-get install -y --no-install-recommends 

    apt-transport-https 

    ca-certificates 

    curl 

    software-properties-common

This should be copy-pasted as-is (except the leading $) or typed in similarly. By removing the newlines, this is what happened:

$ printf "|%s|n" sudo apt-get -y --no-install-recommends install  curl  apt-transport-https  ca-certificates  curl  software-properties-common

|sudo|

|apt-get|

|-y|

|--no-install-recommends|

|install|

| curl|

| apt-transport-https|

| ca-certificates|

| curl|

| software-properties-common|

As you can see, the spaces became part of the package names. That is why apt-get couldn't find them. Do either of:

sudo apt-get -y --no-install-recommends install curl apt-transport-https ca-certificates software-properties-common

Or:

sudo apt-get -y --no-install-recommends install 

  curl 

  apt-transport-https 

  ca-certificates 

  software-properties-common

Installation from a .deb package

If you cannot use Docker’s repository to install Docker, you can download the .deb file for your release and install it manually. You will need to download a new file each time you want to upgrade Docker.

• Go to https://apt.dockerproject.org/repo/pool/main/d/docker-engine/ and download the .deb file for the Docker version you want to install and for your version of Ubuntu (latest version 1.13.1 for Ubuntu 16.04).



• 
  

  Install Docker, changing the path below to the path where you downloaded the Docker package.

  
  
  

  sudo dpkg -i /path/to/package.deb
  
  

  
  
  

  The Docker daemon starts automatically.

  
  


• 
  

  Verify that docker 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 an informational message and exits.

  
  

Docker is installed and running. You need to use sudo to run Docker commands.

Source: https://docs.docker.com/engine/installation/linux/ubuntu/#install-from-a-package

Although you can set up the repo and install it manually, there is a faster way using the official convenience script.

As of 2018, to install docker-ce on Ubuntu 16.04 or Ubuntu 18.04, the command for the automated install is:

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

Read the security note printed in output toward the end of the install. Note that the script at the URL used above is maintained in the docker-install repo.

This installs the package and the repo. To confirm:

$ apt list docker-ce* 2>&- | grep installed

docker-ce/now 5:18.09.0~3-0~ubuntu-xenial amd64 [installed,local]

docker-ce-cli/now 5:18.09.0~3-0~ubuntu-xenial amd64 [installed,local]

Verify installation:

sudo docker run hello-world

sudo docker version

Continue with post-installation steps.

The Docker installation package available in the official Ubuntu repository may not be the latest version. So I woluld not suggest to intstall docker from Ubuntu repositpry. To get the latest version, install Docker from the official Docker repository.

For doing this first of all we will add , the GPG key for the official Docker repository to our machine by curl command

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

now we will add the Docker repository to my APT sources:

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

update the package database with the Docker packages from the newly added repository

sudo apt-get update

Finally, install Docker by apt-get command

sudo apt-get install -y docker-ce

Docker should now be installed and running. to check weather docker service has been started or not we should run the command sudo service docker status. This will sow me the status of docker service. For detailed information you can watch at https://www.youtube.com/watch?v=fiiJyemUFOc