ubuntu16在运行sudo apt-get update 命令后,报出错误:

Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)

原因:

没有授权连外网!

我用的是校园网!而且虚拟机使用的是桥接模式(虽然本机已经联网,但是虚拟机还未连接到网络。),所以需要在虚拟机的ubuntu里打开浏览器,输入校园的账号密码,登陆。

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