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