在ubuntu更新時，出現錯誤E: Some index files failed to download, they have been ignored, or old ones used inst

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在ubuntu更新時，出現錯誤E: Some index files failed to download, they have been ignored, or old ones used inst
http://www.ilovn.com/topic/ubuntu-update-error-esome-index-files-failed-to-download-they-have-been-ignored-or-old-ones-used-inst/
在ubuntu更新時
執行命令
sudo apt-get update
出現錯誤E: Some index files failed to download, they have been ignored, or old ones used instead
可以將目錄下/var/lib/apt/lists/partial/所有的文件清掉
$ sudo rm /var/lib/apt/lists/* -vf
再次運行apt-get update