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尝试运行 sudo apt update 但收到错误

tag-icon • tag-icon apt updates
尝试运行 sudo apt update 但收到错误

我离开了这个州几个星期，把电脑留在家里，配置了家庭网络和路由器，这样我就可以随时 ssh 进入。它工作正常，我经常远程使用它。但有一天，我去跑步sudo apt update ，没有像往常一样运行更新，而是出现了这个

Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.10.0-30-generic x86_64)

* Documentation:  https://help.ubuntu.com
* Management:     https://landscape.canonical.com
* Support:        https://ubuntu.com/advantage

0 packages can be updated.
0 updates are security updates.

Last login: Wed Aug  9 09:27:54 2017 from 24.3.15.124
sinux@*******:~$ sudo apt update
[sudo] password for sinux:
Get:1 http://archive.canonical.com/ubuntu xenial InRelease [2,004 B]
Get:2 http://us.archive.ubuntu.com/ubuntu xenial InRelease [2,004 B]
Get:3 http://security.ubuntu.com/ubuntu xenial-security InRelease [2,004 B]
Hit:1 http://archive.canonical.com/ubuntu xenial InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:3 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:2 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Ign:3 http://security.ubuntu.com/ubuntu xenial-security InRelease
Get:4 http://security.ubuntu.com/ubuntu xenial-security Release [2,004 B]
Get:5 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [2,004 B]
Get:6 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [2,004 
B]
Get:7 http://us.archive.ubuntu.com/ubuntu xenial Release [2,004 B]
Err:5 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease
  Clearsigned file isn't valid, got 'NOSPLIT' (does the network require 
authentication?)
Err:6 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease
  Clearsigned file isn't valid, got 'NOSPLIT' (does the network require 
authentication?)
Get:8 http://security.ubuntu.com/ubuntu xenial-security Release.gpg [2,004 
B]
Get:9 http://us.archive.ubuntu.com/ubuntu xenial Release.gpg [2,004 B]
Err:8 http://security.ubuntu.com/ubuntu xenial-security Release.gpg
  The following signatures were invalid: NODATA 1  NODATA 2
Err:9 http://us.archive.ubuntu.com/ubuntu xenial Release.gpg
  The following signatures were invalid: NODATA 1  NODATA 2
Reading package lists... Done
E: GPG error: http://security.ubuntu.com/ubuntu xenial-security Release: The 
following signatures were invalid: NODATA 1  NODATA 2
E: GPG error: http://us.archive.ubuntu.com/ubuntu xenial Release: The 
following signatures were invalid: NODATA 1  NODATA 2

有人能帮我解决这个问题吗？我已经连续尝试了好几次了。可能发生了什么事情导致这种情况？

编辑

答案中解释得很好

答案1

好吧，伙计们，我觉得自己很蠢。事情的原因是，当我在对岸时，我家乡的室友没有支付我们的互联网账单，所以我仍然能够通过 SSH 进入，但我的盒子无法访问互联网。所以，@MichaelBay 向我指出的问题和答案一针见血：上游网络问题。就我而言，我没有支付账单…… 不过很有趣，我从来没想过我还能省下这笔钱……那肯定有办法取消我的互联网服务

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