ubuntu apt-get update 失败解决。

当运行apt-get update后出现以下错误时： E: Some index files failed to download, they have been ignored, or old ones used instead. 能够将目录下/var/lib/apt/lists/partial/全部的文件清掉，再次运行apt-get update便可！自带源在大陆很差。ubuntu 出现如下错

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