What if a Failed to fetch occurs when creating a docker mirror update system?

  docker, question

Dockerfile is an example of creating nginx by copying this tutorial:http://www.oschina.net/news/6 …

I have tried to modify 163 and Aliyun’s source servers, but they are all stuck here.
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I have changed the code to 16.04 and installed apt-transport-https. But there are still some mistakes:
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Please consult the great god for treatment. thank you very much!

In progressapt-get updateFront installationapt-transport-https