Installing Docker in Ubuntu, from repo. Can't find a repo-CodePudding

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...

CodePudding user response：

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

CodePudding user response：

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