解决Ubuntu 12.04更新错误：（ – 5 – 没有与主机名关联的地址）
问题描述：
每次我尝试下载操作系统的更新（Ubuntu 12.04）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 ## NB 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 ## NB 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 ## NB 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上此post的相关链接：
服务器错误（-5 – 没有与主机名关联的地址）
更新时如何修复“-5没有与主机名错误相关的地址”？
我试图在线研究解决问题的方法，但我没有弄清楚我得到这些错误的真正原因。 任何可能有助于我解决这个问题的建议，想法或解决方案都非常感谢。
该问题的解决方案如下：
第1步：进入系统 – >首选项 – >网络连接。
步骤2：接下来，选择默认网络接口（eth0）并单击“编辑”。
步骤3：然后选择“IPv4设置”并选择“仅限自动（DHCP）地址”。
步骤4：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
配置完成后，检查以确保它正常运行。
有关解决类似问题的完整分步教程，请检查：
http://www.liberiangeek.net/2010/08/change-dns-information-ubuntu-10-04-lucid-lynx/
以上链接说明了如何更改Ubuntu中的DNS设置。
我有同样的问题，上述答案都没有解决。 我现在已经修好了。 事实certificate我需要做的就是进入终端并键入sudo apt-get update 。 运行完毕后，我的更新管理器刷新了，给了我一个要更新的项目的新列表，然后我点击了更新，一切运行正常。 不知道这是否会对其他人有所帮助，但我希望如此。
cat /etc/apt/sources.list
编辑
sudo gedit /etc/apt/sources.list
删除http://packages.medibuntu.org/
然后运行
sudo apt-get update
如果您只收到与packages.medibuntu.org相关的错误，那么该存储库已根据启动板上的官方repo页面和这些 讨论 主题关闭。
症状：
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://packages.medibuntu.org/dists/precise/free/source/Sources Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/non-free/source/Sources Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/free/binary-amd64/Packages Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/non-free/binary-amd64/Packages Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/free/binary-i386/Packages Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/non-free/binary-i386/Packages Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/free/i18n/Translation-en_US Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/free/i18n/Translation-en Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/non-free/i18n/Translation-en_US Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) W: Failed to fetch http://packages.medibuntu.org/dists/precise/non-free/i18n/Translation-en Something wicked happened resolving 'packages.medibuntu.org:http' (-5 - No address associated with hostname) E: Some index files failed to download. They have been ignored, or old ones used instead.
解：
命令行方法
- 从
/etc/apt/sources.list.d目录中删除medibuntu repo：sudo rm /etc/apt/sources.list.d/medibuntu.list* - 运行
sudo apt-get update - （可选）如果在此之后仍然看到错误，请运行
grep -lir medibuntu /etc/apt/sources.list.d/ | xargs sudo rmgrep -lir medibuntu /etc/apt/sources.list.d/ | xargs sudo rm，然后再次尝试运行第2步 。
GUI方法
- 打开Synaptic Package Manager （按
Super/Winkey然后键入Synaptic Package Manager并单击显示名为Synaptic Package Manager的第一个应用程序结果） - 在应用程序的菜单中，选择
Settings– >Repositories - 选择
Other Software选项卡，然后向下滚动并取消选中或删除packages.medibuntu.org所有条目（参见屏幕截图）
- 单击
Close - 单击Synaptic Package Manager中的“
Reload按钮（在后台运行apt-get update）
如果您有代理，那么此链接有一些答案。
查看设置apt-get以在网页中使用http-proxy部分。