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sudo apt-get update 多次失败

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sudo apt-get update 多次失败

当我运行时我不断得到这个输出sudo apt-get update：

Err:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
  Temporary failure resolving 'security.ubuntu.com'
Err:2 http://ppa.launchpad.net/certbot/certbot/ubuntu xenial InRelease
  Temporary failure resolving 'ppa.launchpad.net'
Err:3 http://et.archive.ubuntu.com/ubuntu xenial InRelease
  Temporary failure resolving 'et.archive.ubuntu.com'
Err:4 http://et.archive.ubuntu.com/ubuntu xenial-updates InRelease
  Temporary failure resolving 'et.archive.ubuntu.com'
Err:5 http://et.archive.ubuntu.com/ubuntu xenial-backports InRelease
  Temporary failure resolving 'et.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://et.archive.ubuntu.com/ubuntu/dists/xenial/InRelease  Temporary failure resolving 'et.archive.ubuntu.com'
W: Failed to fetch http://et.archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease  Temporary failure resolving 'et.archive.ubuntu.com'
W: Failed to fetch http://et.archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease  Temporary failure resolving 'et.archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease  Temporary failure resolving 'security.ubuntu.com'
W: Failed to fetch http://ppa.launchpad.net/certbot/certbot/ubuntu/dists/xenial/InRelease  Temporary failure resolving 'ppa.launchpad.net'
W: Some index files failed to download. They have been ignored, or old ones used instead.

该如何解决此问题？

答案1

尝试编辑您的sources.list
并更改

deb http://et.archive.ubuntu.com/ubuntu xenial main inRelease
deb http://et.archive.ubuntu.com/ubuntu xenial-updates main inRelease
deb http://et.archive.ubuntu.com/ubuntu xenial-backports main inRelease
deb http://et.archive.ubuntu.com/ubuntu xenial-security main inRelease

然后再试一次

sudo apt-get update && sudo apt-get upgrade

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