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Fixing Docker-CE Post Installation Configuration Failure on Ubuntu 20.04

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Docker is an essential tool for developers that allows you to package and run applications in isolated environments called containers. However, you might encounter some issues when installing Docker Community Edition (Docker-CE) on Ubuntu 20.04. This article will guide you through several solutions to fix Docker-CE post-installation configuration failures.

Table of Contents

  1. Disable VPN or Network Tunneling
  2. Remove and Reinstall Docker Packages
  3. Update Storage Driver in daemon.json
  4. Check for Conflicting Docker Installations

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1. Disable VPN or Network Tunneling

Sometimes, VPN or network tunneling services can interfere with Docker’s installation and operation. If you have services like OpenVPN, OpenConnect, Tailscale, or Wireguard running in the background, consider disabling them temporarily before installing Docker.

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2. Remove and Reinstall Docker Packages

If the configuration issue persists, you might need to remove all Docker packages and reinstall them. This can be done using the following commands:

sudo apt-get remove docker docker-engine docker.io containerd runc
sudo apt-get purge docker-ce docker-ce-cli containerd.io
sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerd

The remove command uninstalls the packages, while the purge command removes packages and configuration files. The rm -rf command deletes the Docker and containerd directories.

Afterward, reinstall Docker using the following command:

sudo apt-get install docker.io

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3. Update Storage Driver in daemon.json

In some cases, modifying the daemon.json file to update the storage driver configuration can solve the issue. You can use a text editor to edit the file:

sudo nano /etc/docker/daemon.json

Then, add the following line:

{ "storage-driver": "devicemapper" }

The storage-driver parameter specifies the storage driver Docker should use. devicemapper is one of the options Docker supports.

After saving the file, restart the Docker service:

sudo systemctl restart docker

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4. Check for Conflicting Docker Installations

Ensure that there are no conflicting Docker installations, such as having both docker.io from Debian/Ubuntu and docker-ce from docker.com installed. Use the following command to check for installed Docker packages:

dpkg -l | grep -i docker

The dpkg -l command lists all installed packages, while grep -i docker filters the output for lines containing the word “docker”.

If you find any conflicting packages, remove them using the apt-get remove command mentioned earlier.

Conclusion

These solutions should help you resolve the Docker-CE post-installation configuration failure on Ubuntu 20.04. However, if none of these solutions work, you may need to perform further troubleshooting or seek assistance from Docker support or the Ubuntu community. Remember, the key to solving any technical issue is patience and persistence. Good luck!

How do I check if Docker is installed on Ubuntu 20.04?

You can check if Docker is installed on Ubuntu 20.04 by running the following command in the terminal: docker --version. If Docker is installed, it will display the version number. If Docker is not installed, it will show an error message.

How do I add my user to the Docker group on Ubuntu 20.04?

To add your user to the Docker group on Ubuntu 20.04, you can use the following command: sudo usermod -aG docker your_username. Replace "your_username" with your actual username. After running this command, you will need to log out and log back in for the changes to take effect.

How do I run a Docker container on Ubuntu 20.04?

To run a Docker container on Ubuntu 20.04, you can use the docker run command followed by the image name. For example, to run a container based on the "ubuntu" image, you can use the following command: docker run ubuntu. You can also specify additional options and configurations as needed.

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