输入代码：sudo docker run hello - world
结果：Unable to find image ' hello - world : latest ' locally
docker : Error response from daemon : Get "https://registry-1.docker.io/v2/": net /
http : request canceled while waiting for connection ( Client . Timeout exceeded whi
le awaiting headers )
Run ' docker run -- help ' for more information
老师麻烦问一下我在下完docker后，输入代码测试发现安装应该是未成功，你看是网络问题还是什么其他原因造成的
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