Docker安装镜像时出现failed to get default registry endpoint from daemon怎么解决

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• 1.docker pull ubuntu:18.04

Warning: failed to get default registry endpoint from daemon (Cannot connect to the Docker daemon. Is the docker daemon running on this host?). Using system default: https://index.docker.io/v1/
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

原因没有sudo，正确写法 sudo docker pull + 软件或要安装的资源。

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