Should I install Docker from the official repo or Ubuntu's universe?

Always prefer Docker's official APT repository (download.docker.com). The 'docker.io' package in Ubuntu's universe is often 1-2 major versions behind, lacks timely security patches, and may not include newer features like BuildKit or the v2 compose plugin. The official repository also ensures you get coordinated updates with the Docker daemon, containerd, and runc.

Why does my nftables/ufw firewall break Docker networking on Ubuntu 24.04?

Ubuntu 24.04 uses nftables as the default firewall backend, but Docker manipulates iptables directly to create its bridge network rules. When nftables is loaded, it can flush the iptables chains Docker creates, or Docker's iptables rules can bypass UFW rules since Docker adds its own chains. The solution is to either: (1) set 'iptables=false' in '/etc/docker/daemon.json' and manage rules manually, (2) use UFW's 'DEFAULT_FORWARD_POLICY="ACCEPT"' along with UFW's 'DOCKER-USER' chain, or (3) switch to rootless Docker which uses slirp4netns and avoids this conflict entirely.

Do I need to uninstall old Docker versions before installing the new one?

Yes, it's strongly recommended. Before installing Docker Engine, run 'sudo apt remove docker docker-engine docker.io containerd runc' to clean up any old or conflicting packages. This prevents version conflicts, especially if you previously installed Docker via snap (which is another common installation method on Ubuntu that conflicts with the apt-installed Docker daemon). Configuration files in '/etc/docker/' and data in '/var/lib/docker/' are preserved by default.

What is the difference between Docker Engine and Docker Desktop on Ubuntu 24.04?

Docker Engine is the open-source container runtime (dockerd + containerd) that runs natively on Linux and is what most servers use. Docker Desktop is a commercial product that includes Docker Engine plus a GUI, Kubernetes, dev environments, and extensions, but on Linux it runs the daemon inside a virtual machine (using QEMU/KVM), which adds overhead. For servers, CI/CD pipelines, and most production use cases, Docker Engine is preferred. Docker Desktop is aimed at developers who want a Mac/Windows-like experience on Ubuntu desktop.

How do I run Docker without root or sudo after installation?

Add your user to the 'docker' group with 'sudo usermod -aG docker $USER', then log out and back in. Verify with 'docker ps' (should work without sudo). Note: members of the 'docker' group have root-equivalent privileges on the host, which is a security concern. For truly rootless operation, install 'dockerd-rootless' from the 'docker-ce-rootless-extras' package, which uses user namespaces and is the recommended approach for multi-tenant or security-sensitive environments.

How do I verify my Docker installation is working and secure?

Run 'docker run hello-world' to confirm the engine, CLI, and network work end-to-end. Then run 'docker info' to check the server version, storage driver (should be overlay2), cgroup driver (cgroupfs or systemd), and security options. For security verification, run 'docker scan ' (deprecated but available) or use 'trivy' to scan images, check that experimental features are disabled, and ensure you're pulling from trusted registries. You can also run 'docker bench security' using the docker/docker-bench-security image to audit your configuration against CIS benchmarks.

What should I do if I get 'permission denied' errors connecting to /var/run/docker.sock?

This means your user is not in the 'docker' group or the socket permissions are wrong. First, verify group membership with 'groups $USER' and re-add with 'sudo usermod -aG docker $USER' if needed, then re-login. If still failing, check socket ownership with 'ls -l /var/run/docker.sock' (should be root:docker with 0660 or 0666). Never use 'chmod 777' as a fix. If running as a service account or in CI, use a Docker socket proxy like 'tecnativa/docker-socket-proxy' to enforce least-privilege access.

Home › Tutorials & How-To › How to Install Docker on Ubuntu 24.04: Step-by-Step Guide

How to Install Docker on Ubuntu 24.04: Step-by-Step Guide

By Brieflyn Editorial Team • Published: July 20, 2026 • 6 min read (1,082 words) • 13 views

Learn how to install Docker on Ubuntu 24.04 Noble Numbat. Follow our expert guide to set up Docker Engine and Docker Compose for your containerized apps.

Quick Navigation / Table of Contents 8 Sections

01. Introduction to Docker on Ubuntu 24.04 Noble Numbat 02. Prerequisites and System Requirements 03. Step‑By‑Step Guide to Installing Docker Engine 04. Post‑Installation Configuration 05. Docker Best Practices for Ubuntu Users 06. Common Installation Issues and Troubleshooting 07. Frequently Asked Questions (FAQs) 08. Conclusion: Getting Started with Your First Container

How to Install Docker on Ubuntu 24.04: Step‑By‑Step Guide

Introduction to Docker on Ubuntu 24.04 Noble Numbat

What is Docker?

Docker is a platform that packages an application together with everything it needs—libraries, runtime, system tools—into a single, portable container. The container runs the same way on any Linux host that has Docker installed, eliminating the “it works on my machine” problem.

Why Use Docker on Ubuntu 24.04 Noble Numbat?

Ubuntu 24.04 is the newest LTS release, bringing cgroups v2, nftables as the default firewall, and a modern kernel that Docker leverages for better performance and security. Installing Docker from the official repository gives you the latest engine, containerd 2.x, and BuildKit support out of the box.

Prerequisites and System Requirements

Shipping containers and cranes at Hamburg port showcasing global trade. — Photo by Wolfgang Weiser via Pexels. How To Install Docker On Ubuntu 2404 Step By Step Guide.

Hardware Requirements

64‑bit processor (Intel x86_64 or ARM64)
At least 2 GB RAM (4 GB recommended for development)
Minimum 10 GB of free disk space for images and containers

Updating Your System Package Index

Before adding new repositories, make sure the local package cache is fresh.

sudo apt update && sudo apt upgrade -y

Installing Necessary Dependencies

Docker needs a few helper packages for HTTPS and certificate handling.

sudo apt install -y ca-certificates curl gnupg lsb-release

Step‑By‑Step Guide to Installing Docker Engine

Adding the Official Docker GPG Key

Docker signs its packages with a GPG key. Store the key in /etc/apt/keyrings and bind it to the repository.

sudo mkdir -p /etc/apt/keyrings curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg sudo chmod a+r /etc/apt/keyrings/docker.gpg

Setting Up the Stable Docker Repository

Use the lsb_release command to insert the correct codename (Noble).

echo \ "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] \ https://download.docker.com/linux/ubuntu \ $(lsb_release -cs) stable" | \ sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Installing Docker Engine, CLI, and Containerd

sudo apt update sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

The docker-compose-plugin provides the modern docker compose command (Compose V2) directly integrated with the Docker CLI.

Verifying the Docker Installation

Check that the daemon is running and pull the test image.

sudo systemctl status docker --no-pager docker run --rm hello-world

If the container prints a friendly greeting, Docker is ready.

Post‑Installation Configuration

Sunlight casts shadows on a rustic brick staircase with iron railing in Baku. — Photo by Fakhri Baghirov via Pexels. How To Install Docker On Ubuntu 2404 Step By Step Guide.

Managing Docker as a Non‑Root User

Docker groups grant root‑equivalent access, so add yourself to the group and re‑login.

sudo usermod -aG docker $USER newgrp docker # optional, applies group change without logout

Test the setup:

docker ps

Configuring Docker to Start on Boot

sudo systemctl enable docker sudo systemctl start docker

Installing Docker Compose (optional)

If you prefer the legacy Python binary, you can install it, but the integrated plugin is already present. For completeness:

sudo curl -L "https://github.com/docker/compose/releases/download/v2.24.5/docker-compose-$(uname -s)-$(uname -m)" \ -o /usr/local/bin/docker-compose sudo chmod +x /usr/local/bin/docker-compose docker compose version # should report v2.x

Docker Best Practices for Ubuntu Users

Optimizing Storage Drivers

Ubuntu 24.04 defaults to overlay2, which works well on ext4 and XFS. If you run on ZFS or Btrfs, set the driver explicitly:

sudo mkdir -p /etc/docker cat > /etc/docker/daemon.json <<EOF { "storage-driver": "overlay2" } EOF sudo systemctl restart docker

Managing Container Resource Limits

With cgroups v2 active, you can limit CPU and memory per container directly in the run command:

docker run -d --name web \ --cpus="1.5" --memory="500m" \ nginx:latest

Securing Your Docker Daemon

Enable Docker Content Trust: export DOCKER_CONTENT_TRUST=1 (or add to ~/.bashrc).
Run a security audit with the official benchmark image:

docker run -it --net host --pid host \ -v /var/lib/docker:/var/lib/docker \ -v /etc:/etc \ -v /usr/bin/docker:/usr/bin/docker \ docker/docker-bench-security

Common Installation Issues and Troubleshooting

Fixing GPG Key Errors

If apt complains about a missing public key, re‑download the key and ensure the signed-by reference matches the file path.

Resolving Permission Denied Errors

Typical cause: the user isn’t in the docker group or the socket permissions are wrong.

ls -l /var/run/docker.sock # Expected: srw-rw---- 1 root docker … /var/run/docker.sock

Adjust with:

sudo chown root:docker /var/run/docker.sock sudo chmod 660 /var/run/docker.sock

Handling Network Connectivity Issues

Ubuntu 24.04 ships with nftables; Docker still relies on iptables. If you see “network is unreachable” inside containers, either switch the kernel to use iptables-legacy or tell Docker to use the nftables backend.

sudo update-alternatives --set iptables /usr/sbin/iptables-legacy sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy sudo systemctl restart docker

Alternatively, add a Docker‑specific rule set to /etc/nftables.conf and reload.

Frequently Asked Questions

Yes, Docker officially supports Ubuntu 24.04 (Noble Numbat). The official Docker Engine installation guide has been updated to include Ubuntu 24.04 since its release in April 2024. Both Docker Engine (Community) and Docker Desktop are supported, though Docker Desktop requires a GUI environment and uses a VM-based architecture.