Install Docker on Ubuntu 26.04 (the right way, with the docker-group truth)

The wrong way to install Docker on Ubuntu is the one that looks easiest: sudo apt install docker.io. That package exists, it installs, and it runs a container. It is also whatever version happened to be frozen into the archive when 26.04 was cut, it lags the real releases by months, and it ships without the Compose and Buildx plugins you will want by the end of the week. Use Docker's own apt repository instead, and this is the post I keep open so I do not re-derive the repo setup from memory each time.

This is short on purpose. The steps are the official ones, and the only place worth slowing down is step 5, where adding yourself to the docker group quietly hands out root. That tradeoff is the part most guides skip, and it is the one thing here actually worth reading twice.

TL;DR Remove any distro docker.io/containerd packages, add Docker's GPG key and the deb822 .sources repo, then sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin. Verify with sudo docker run hello-world. Add yourself to the docker group to drop the sudo (it is root-equivalent, more below).

Prerequisites

• Ubuntu 26.04 (Resolute Raccoon), server or desktop, on amd64 or arm64.


• A user with sudo. If you are still on root, runs the whole daemon as your user instead, at the cost of a few limitations around ports below 1024 and some networking.
  
  
  

  
  
  
  Quick reference
  

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Job	Command
  Remove distro packages	`sudo apt remove $(dpkg --get-selections docker.io docker-compose docker-compose-v2 docker-doc podman-docker containerd runc \
  Add GPG key	{% raw %}sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
  Install engine + plugins	sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
  Verify	sudo docker run hello-world
  Drop the sudo	sudo usermod -aG docker $USER then re-login
  Compose command	docker compose up (space, not docker-compose)
  Check the daemon	systemctl is-active docker

  
  
  

  Use Docker's repo, not the distro package, so you get real versions and the Compose and Buildx plugins. Clear out the old packages first, trust the key, and let apt pull the real thing. Then decide with open eyes whether the docker group is a trade you want, because it hands out root. With that done, the box is ready for the actual reason you installed Docker: running something. A natural next step is putting .

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