title: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (Ubuntu 20.04 ,WSL2)
body: <p>I have <em><strong>Microsoft Windows 10 Pro</strong></em> version <em><strong>10.0.19041 N/A Build 19041</strong></em> and I follow steps here <a href="https://docs.microsoft.com/en-us/windows/wsl/install-win10" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/windows/wsl/install-win10</a> to install <em><strong>Ubuntu 20.04 LTS</strong></em> on it using <strong>WLS2</strong> , I'm doing so to install <strong>docker</strong> by following steps here <a href="https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository" rel="nofollow noreferrer">https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository</a>
  but when I try to run <code>sudo docker run hello-world</code> it gives me this error <em>docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
  See 'docker run --help'.</em> I know that a similar question asked here <a href="https://stackoverflow.com/questions/44678725/cannot-connect-to-the-docker-daemon-at-unix-var-run-docker-sock-is-the-docker">Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running?</a> ,and I try to run <code>systemctl daemon-reload</code> and <code>systemctl start docker</code> but al the solutions does not worked for me it gives me another errors like <em>System has not been booted with systemd as init system (PID 1). Can't operate.
  Failed to connect to bus: Host is down</em> and Also try to fix it but I can't, So I need your help.</p>
  <p><strong>Note :</strong> I have already install Docker in windows and It works fine.</p>