+ docker pull ubuntu:bionic bionic: Pulling from library/ubuntu 7c457f213c76: Pulling fs layer 7c457f213c76: Verifying Checksum 7c457f213c76: Download complete 7c457f213c76: Pull complete Digest: sha256:152dc042452c496007f07ca9127571cb9c29697f42acbfad72324b2bb2e43c98 Status: Downloaded newer image for ubuntu:bionic docker.io/library/ubuntu:bionic