Installing Docker on Ubuntu

Installing Docker on Ubuntu-based Linux distributions: Linux Mint, Zorin, Pop OS, etc. is simple!

Installing Docker from CLI

Docker is available in the default repositories of apt. Install via:

1

sudo apt install docker.io

Add permissions to the docker group by adding the current user:

1

sudo usermod -a -G docker $(whoami)

Verify that everything worked:

1

docker ps

Output:

1

CONTAINER ID        IMAGE               COMMAND             CREATED

Troubleshooting

If the following error occurs after docker ps:

1

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/json: dial unix /var/run/docker.sock: connect: permission denied

1. Check if Docker is running:

1

sudo systemctl status docker

the status should show active (running).

If not, restart the docker service with the following command:

1

sudo systemctl restart docker

2. Verify that the current user is apart of the docker group

1

grep docker /etc/group

the output should show docker:x:135:USER with USER as the current user given from $(whoami). If not, add the current user to the docker group using the instructions above.

3. Verify that the tty session shows correct group membership

1

id -nG

the output should contain docker in the list. If not, reboot.

4. Reboot

If all the prior steps were successful, simply reboot.

1

sudo reboot