SHELL

Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?

Add this to the bitbucket-pipeline.yaml file, on the right step:
services:
  - docker

Cannot connect to the Docker daemon at tcp://0.0.0.0:2375. Is the docker daemon running?

Nothing works!!! Just install Linux directly on your system

docker: Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?

This is the error I see if I forget to use sudo when running Docker.