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

1.删除 /var/lib/apt/lists/所有文件  $ sudo rm /var/lib/apt/lists/* -vf 有文件夹不能删除的话使用  $ sudo rm -rf /var/lib/apt/lists/* $ sudo rm /var/lib/apt/lists/* -vf 2.再次更新  $ sudo apt-get update 3.如果还是不行，那可能就是源有问题了，我

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