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[Translated]20150518 Linux FAQs with Answers--How to fix '404 Not Found' error with 'apt-get update' on old Ubuntu.md
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Translating by GOLinux!
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Linux FAQs with Answers--How to fix “404 Not Found” error with “apt-get update” on old Ubuntu
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> **Question**: I have old Ubuntu 13.04 (Raring Ringtail) installation on my PC. When I run "sudo apt-get update" on it, it throws a bunch of "404 Not Found" errors, and I cannot install or update any package using apt-get or aptitude. Due to this error I cannot even upgrade it to a newer release. How can I fix this problem?
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Every Ubuntu release has its end-of-life (EOL) time; regular Ubuntu releases are supported for 18 months, while LTS (Long Term Support) versions are supported up to 3 years (server edition) and 5 years (desktop edition). Once a Ubuntu release has reached EOL, its repositories will no longer be accessible, and you won't get any maintenance updates and security patches from Canonical. As of this writing, Ubuntu 13.04 (Raring Ringtail) has already reached EOL.
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If the Ubuntu system you are using is EOL-ed, you will get the following 404 errors from apt-get or aptitude as its repositories have been deprecated.
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W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/raring-backports/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80]
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W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found
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W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/universe/binary-i386/Packages 404 Not Found [IP: 91.189.88.149 80]
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E: Some index files failed to download. They have been ignored, or old ones used instead
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For those users who are using old versions of Ubuntu, Canonical maintains old-releases.ubuntu.com, which is an archive of EOL-ed repositories. Thus, when Canonical's support for your Ubuntu installation ends, you need to switch to repositories at old-releases.ubuntu.com (unless you want to upgrade it before EOL).
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Here is a quick way to fix "404 Not Found" errors on old Ubuntu by switching to old-releases repositories.
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First, replace main/security repositories with old-releases versions as follows.
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$ sudo sed -i -r 's/([a-z]{2}\.)?archive.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
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$ sudo sed -i -r 's/security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
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Then open /etc/apt/sources.list with a text editor, and look for extras.ubuntu.com. This repository is also no longer supported for 13.04. So you need to comment out extras.ubuntu.com by prepending '#' sign.
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#deb http://extras.ubuntu.com/ubuntu raring main
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#deb-src http://extras.ubuntu.com/ubuntu raring main
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Now you should be able to install or update packages on an old unsupported Ubuntu release.
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/404-not-found-error-apt-get-update-ubuntu.html
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作者：[Dan Nanni][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni
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Linux有问必答——在旧的Ubuntu上如何修复“apt-get update”的“404 Not Found”错误
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> **问题**： 我的PC上安装了旧版的Ubuntu 13.04（急切的浣熊）。当我在上面运行“sudo apt-get update”时，它丢给了我一大堆“404 Not Found”错误，结果是我不能使用apt-get或aptitude来安装或更新任何软件包了。由于该错误的原因，我甚至不能将它升级到更新的版本。我怎样才能修复这个问题啊？
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>
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每个Ubuntu版本都有生命结束周期（EOL）时间；常规的Ubuntu发行版提供18个月的支持，而LTS（长期支持）版本则长达3年（服务器版本）和5年（桌面版本）。当某个Ubuntu版本达到生命结束周期时，其仓库就不能再访问了，你也不能再从Canonical获取任何维护更新和安全补丁。在撰写本文时，Ubuntu 13.04（急切的浣熊）已经达到了它的生命结束周期。
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如果你所使用的Ubuntu系统已经被结束生命周期，你就会从apt-get或aptitude得到以下404错误，因为它的仓库已经被遗弃了。
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W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/raring-backports/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80]
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W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found
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W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/universe/binary-i386/Packages 404 Not Found [IP: 91.189.88.149 80]
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E: Some index files failed to download. They have been ignored, or old ones used instead
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对于那些还在使用旧版本Ubuntu的用户，Canonical维护了一个old-releases.ubuntu.com的网站，这里包含了结束生命周期的仓库归档。因此，当Canonical对你安装的Ubuntu版本结束支持时，你需要将仓库切换到old-releases.ubuntu.com（除非你在结束生命周期之前想要升级）。
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这里，通过切换到旧版本仓库提供了一个快速修复“404 Not Found”错误的便捷方式。
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首先，使用旧版本仓库替换main/security仓库，就像下面这样。
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$ sudo sed -i -r 's/([a-z]{2}\.)?archive.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
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$ sudo sed -i -r 's/security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
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然后，使用文本编辑器打开/etc/apt/sources.list，并查找extras.ubuntu.com。该仓库也不再支持Ubuntu 13.04了，所以你需要使用“#”号将extras.ubuntu.com注释掉。
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#deb http://extras.ubuntu.com/ubuntu raring main
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#deb-src http://extras.ubuntu.com/ubuntu raring main
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现在，你应该可以在旧版不受支持的Ubuntu上安装或更新软件包了。
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/404-not-found-error-apt-get-update-ubuntu.html
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作者：[Dan Nanni][a]
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译者：[GOLinux](https://github.com/GOLinux)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni
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