为什么不能 apt 解析名称？

Question

像一堆其他问题一样，我apt-get update 有时无法运行。重新启动或等待一段时间会使问题消失。我在浏览器中 ping 或访问相应的 URL 从来没有问题。

我已经尝试了所有投票的答案都无济于事。什么apt与ping我的浏览器如此不同？例如，当我运行时，apt-get update我看到：

Err:1 https://download.docker.com/linux/ubuntu xenial InRelease
  Could not resolve host: download.docker.com
Err:2 https://deb.opera.com/opera-stable stable InRelease
  Could not resolve host: deb.opera.com
Err:3 http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu xenial InRelease
  Could not resolve 'ppa.launchpad.net'
Err:4 http://ppa.launchpad.net/saiarcot895/myppa/ubuntu xenial InRelease
  Could not resolve 'ppa.launchpad.net'
Err:5 http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu xenial InRelease
  Could not resolve 'ppa.launchpad.net'
Err:6 http://repository.spotify.com stable InRelease
  Could not resolve 'repository.spotify.com'
Err:7 http://dl.google.com/linux/chrome/deb stable InRelease
  Could not resolve 'dl.google.com'
Err:8 http://archive.ubuntu.com/ubuntu xenial InRelease
  Could not resolve 'archive.ubuntu.com'
Err:9 http://archive.ubuntu.com/ubuntu xenial-updates InRelease
  Could not resolve 'archive.ubuntu.com'
Err:10 http://archive.ubuntu.com/ubuntu xenial-backports InRelease
  Could not resolve 'archive.ubuntu.com'
Err:11 http://archive.ubuntu.com/ubuntu xenial-security InRelease
  Could not resolve 'archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/InRelease  Could not resolve 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease  Could not resolve 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease  Could not resolve 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-security/InRelease  Could not resolve 'archive.ubuntu.com'
W: Failed to fetch https://download.docker.com/linux/ubuntu/dists/xenial/InRelease  Could not resolve host: download.docker.com
W: Failed to fetch http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu/dists/xenial/InRelease  Could not resolve 'ppa.launchpad.net'
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/InRelease  Could not resolve 'dl.google.com'
W: Failed to fetch https://deb.opera.com/opera-stable/dists/stable/InRelease  Could not resolve host: deb.opera.com
W: Failed to fetch http://ppa.launchpad.net/saiarcot895/myppa/ubuntu/dists/xenial/InRelease  Could not resolve 'ppa.launchpad.net'
W: Failed to fetch http://repository.spotify.com/dists/stable/InRelease  Could not resolve 'repository.spotify.com'
W: Failed to fetch http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu/dists/xenial/InRelease  Could not resolve 'ppa.launchpad.net'
W: Some index files failed to download. They have been ignored, or old ones used instead.

运行ping download.docker.com：

PING d2h67oheeuigaw.cloudfront.net (52.85.41.233) 56(84) bytes of data.
64 bytes from server-52-85-41-233.mel50.r.cloudfront.net (52.85.41.233): icmp_seq=1 ttl=251 time=18.8 ms
64 bytes from server-52-85-41-233.mel50.r.cloudfront.net (52.85.41.233): icmp_seq=2 ttl=251 time=18.4 ms
64 bytes from server-52-85-41-233.mel50.r.cloudfront.net (52.85.41.233): icmp_seq=3 ttl=251 time=19.5 ms

在我的浏览器中访问页面工作正常。我怎样才能apt-get“正常工作”？

这是我的内容/etc/apt/resolv.conf：

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
search home.gateway

Answer 1

从运行终端命令，你可以使用apt，并apt-get在未来的正常:)

echo 'Acquire::ForceIPv4 "true";' | sudo tee /etc/apt/apt.conf.d/99force-ipv4