解决 Ubuntu 12.04 更新错误：（-5 - 没有与主机名关联的地址）

Question

问题描述：

每次我尝试为我的操作系统 (Ubuntu 12.04) 下载更新时，我都会收到以下错误消息列表：

W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release.gpg  Something wicked happened resolving 'extras.ubuntu.com:http' (-5 - No address associated with hostname)
, W:Failed to fetch http://ppa.launchpad.net/deluge-team/ppa/ubuntu/dists/precise/Release.gpg  Something wicked happened resolving 'ppa.launchpad.net:http' (-5 - No address associated with hostname)
, W:Failed to fetch http://packages.medibuntu.org/dists/precise/Release.gpg  Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname)
, W:Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/Release.gpg  Something wicked happened resolving 'archive.canonical.com:http' (-5 - No address associated with hostname)
, W:Failed to fetch http://ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/precise/Release.gpg  Something wicked happened resolving 'ppa.launchpad.net:http' (-5 - No address associated with hostname)
, E:Some index files failed to download. They have been ignored, or old ones used instead.

(/etc/apt/sources.list) 文件的内容：

# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu precise main restricted
deb-src http://archive.ubuntu.com/ubuntu precise main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu precise-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu precise-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu precise universe
deb-src http://archive.ubuntu.com/ubuntu precise universe
deb http://archive.ubuntu.com/ubuntu precise-updates universe
deb-src http://archive.ubuntu.com/ubuntu precise-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu precise multiverse
deb-src http://archive.ubuntu.com/ubuntu precise multiverse
deb http://archive.ubuntu.com/ubuntu precise-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu precise-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.

deb http://archive.ubuntu.com/ubuntu precise-security main restricted
deb-src http://archive.ubuntu.com/ubuntu precise-security main restricted
deb http://archive.ubuntu.com/ubuntu precise-security universe
deb-src http://archive.ubuntu.com/ubuntu precise-security universe
deb http://archive.ubuntu.com/ubuntu precise-security multiverse
deb-src http://archive.ubuntu.com/ubuntu precise-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
# deb-src http://extras.ubuntu.com/ubuntu precise main

(/etc/apt/sources.list.d) 目录中的文件：

-rw-r--r-- 1 root root 136 Oct 10 16:30 deluge-team-ppa-precise.list    
-rw-r--r-- 1 root root 136 Oct 10 16:30 deluge-team-ppa-precise.list.save         
-rw-r--r-- 1 root root 285 Oct 10 16:30 medibuntu.list        
-rw-r--r-- 1 root root 285 Oct 10 16:30 medibuntu.list.save          
-rw-r--r-- 1 root root 132 Oct 10 16:30 tualatrix-ppa-precise.list         
-rw-r--r-- 1 root root 134 Oct 10 16:30 tualatrix-ppa-precise.list.save          
-rw-r--r-- 1 root root 148 Oct 10 16:30 yannubuntu-boot-repair-precise.list       
-rw-r--r-- 1 root root 148 Oct 10 16:30 yannubuntu-boot-repair-precise.list.save  

AskUbuntu.com 上这篇文章的相关链接：

服务器错误（-5 - 没有与主机名关联的地址）
如何在更新时修复“-5 没有与主机名关联的地址”？

I have tried to research online for ways to solve the issue but i failed to figure out the real reason why i am getting those errors. Any suggestions, ideas or solutions that might aid me to solve this issue are greatly appreciated.

Answer 1

这个问题的解决方法如下：

步骤 1：转到系统 –> 首选项 –> 网络连接。

第 2 步：接下来，选择您的默认网络接口 (eth0) 并单击“编辑”。

第 3 步：然后选择“IPv4 设置”并选择“仅自动 (DHCP) 地址”。

第 4 步：接下来，在“DNS 服务器”框中输入新的 DNS 服务器地址。使用逗号分隔多个地址，然后单击“应用”进行保存。

第 5 步：选择您首选的 DNS 详细信息

OpenDNS           --->  208.67.222.222, 208.67.220.220              
Google Public DNS --->  8.8.8.8, 8.8.4.4                 
Comodo Secure DNS --->  156.154.70.22, 156.154.71.22

配置后，通过联机检查以确保其正常工作。

有关解决类似问题的完整分步教程，请查看：http :
//www.liberiangeek.net/2010/08/change-dns-information-ubuntu-10-04-lucid-lynx/

上面的链接解释了如何在 Ubuntu 中更改 DNS 设置。