在Ubuntu更新时，出现错误E: Some index files failed to download, they have been ignored, or old ones used inst

在ubuntu更新时

执行命令

sudo apt-get update

出现错误E: Some index files failed to download, they have been ignored, or old ones used instead
可以将目录下/var/lib/apt/lists/partial/所有的文件清掉

$ sudo rm /var/lib/apt/lists/* -vf

再次运行sudo apt-get update