Add warning

docs/docker-ubuntu.md

@@ -1,5 +1,12 @@
 # Installing the Docker Engine on Ubuntu
 
+> **Warning:** when using Ubuntu, for the tutorials, it is not recommended to run `apt get install docker` directly to
+> install Docker
+>
+> This is because the default Docker package associated with Ubuntu can be outdated and will install an obsolete Docker
+> version leading to issues with `docker` and `docker-compose` versions. Check you are using Docker version 24.0.x or
+> higher and Docker Compose 2.29.x or higher and upgrade if necessary.
+
 Further details can be found under: `https://docs.docker.com/engine/install/ubuntu/#set-up-the-repository`
 
 ## Install using the repository