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无法使用docker：ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

无法启动docker 报错["Job for docker.service failed because the control process exited with error code"](https://stackoverflow.com/questions/55906503/docker-how-to-fix-job-for-docker-service-failed-because-the-control-process-ex)

解决docker拉取镜像问题之一