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44 lines
2.6 KiB
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Linux FAQs with Answers--How to find and remove obsolete PPA repositories on Ubuntu
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> **Question**: I was trying to re-synchronize package index files by running apt-get update. But I am getting the following "404 Not Found" errors. Looks like I cannot fetch the latest index from some third-party PPA repositories that I've added before. How can I clean up such broken and old PPA repositories?
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Err http://ppa.launchpad.net trusty/main amd64 Packages
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404 Not Found
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Err http://ppa.launchpad.net trusty/main i386 Packages
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404 Not Found
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W: Failed to fetch http://ppa.launchpad.net/finalterm/daily/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found
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W: Failed to fetch http://ppa.launchpad.net/finalterm/daily/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found
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E: Some index files failed to download. They have been ignored, or old ones used instead.
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When you attempt to update APT package indexes, "404 Not Found" errors can often happen after distro upgrade. That is, after you upgraded your Ubuntu release, some third-party PPA repositories which you added on the old release are no longer supported on the upgraded release. In that case, you can **identify and purge those broken PPA repositories** as follows.
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First, find out the PPAs which cause "404 Not Found" failures.
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$ sudo apt-get update | grep "Failed"
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In this example, the PPA repository which is no longer supported in Ubuntu Trusty is "ppa:finalterm/daily".
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Go ahead and [remove the PPA repository][1]（注：此文原文在同一个更新中，文件名：“20140915 Linux FAQs with Answers--How to remove PPA repository from command line on Ubuntu.md”）.
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$ sudo add-apt-repository --remove ppa:finalterm/daily
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You have to repeat this process for every obsolete PPA repository that you found from above.
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After removing all obsolete PPA repositories, re-run "apt-get update" to check all of them have been successfully removed.
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/find-remove-obsolete-ppa-repositories-ubuntu.html
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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](http://linux.cn/) 荣誉推出
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[1]:http://ask.xmodulo.com/how-to-remove-ppa-repository-from-command-line-on-ubuntu.html |