sudo apt-get update E: Some index files failed to download. They have been ignored, or old ones use

执行 sudo apt-get update,出现以下问题：

W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/trusty-security/universe/i18n/Translation-en  Hash Sum mismatch

E: Some index files failed to download. They have been ignored, or old ones used instead.

解决办法：

1.  https://docs.bazel.build/versions/master/install-ubuntu.html

or

2.  http://blog.csdn.net/ronghua_liu/article/details/8609450

or

3. http://blog.csdn.net/tankaro/article/details/49449817

or

4. http://blog.csdn.net/xueer767/article/details/72868953

or

5.  http://blog.csdn.net/garrison_Z/article/details/12048963

or

6.  http://blog.csdn.net/bigboygo/article/details/77119334

or

7.假如你使用anaconda已经安装成功TensorFlow。就没必要再安装TensorFlow官方文档中文版的“源码安装”了，也没有必要 sudo apt-get update了

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