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

1.刪除 /var/lib/apt/lists/所有文件  $ sudo rm /var/lib/apt/lists/* -vf 有文件夾不能刪除的話使用  $ sudo rm -rf /var/lib/apt/lists/* $ sudo rm /var/lib/apt/lists/* -vf 2.再次更新  $ sudo apt-get update 3.如果還是不行，那可能就是源有問題了，我

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