我遇到了一个sudo apt-get update似乎无法修复的问题，它导致我想要执行的许多安装出现问题。我运行的是 Ubuntu 12.04。
Ign http://ftp.availo.se precise InRelease
Ign http://ftp.availo.se precise-updates InRelease
Ign http://ftp.availo.se precise-backports InRelease
Ign http://ftp.availo.se precise-security InRelease
Get:1 http://repository.spotify.com stable InRelease [2,979 B]
Ign http://ppa.launchpad.net precise InRelease
Ign http://extras.ubuntu.com precise InRelease
Ign http://archive.canonical.com precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://repository.spotify.com stable InRelease
Ign http://ftp.availo.se precise Release.gpg
Ign http://ftp.availo.se precise-updates Release.gpg
Ign http://ftp.availo.se precise-backports Release.gpg
Ign http://repository.spotify.com stable/non-free amd64 Packages/DiffIndex
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://archive.canonical.com precise Release.gpg
Hit http://extras.ubuntu.com precise Release.gpg
Ign http://ftp.availo.se precise-security Release.gpg
Ign http://repository.spotify.com stable/non-free i386 Packages/DiffIndex
Ign http://repository.spotify.com stable/non-free TranslationIndex
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://archive.canonical.com precise Release
Hit http://extras.ubuntu.com precise Release
Ign http://ftp.availo.se precise Release
Ign http://ftp.availo.se precise-updates Release
Hit http://ppa.launchpad.net precise Release
Hit http://archive.canonical.com precise/partner amd64 Packages
Hit http://extras.ubuntu.com precise/main Sources
Ign http://ftp.availo.se precise-backports Release
Ign http://ftp.availo.se precise-security Release
Hit http://ppa.launchpad.net precise Release
Hit http://archive.canonical.com precise/partner i386 Packages
Ign http://archive.canonical.com precise/partner TranslationIndex
Hit http://ppa.launchpad.net precise Release
Hit http://extras.ubuntu.com precise/main amd64 Packages
Hit http://extras.ubuntu.com precise/main i386 Packages
Ign http://ftp.availo.se precise/main TranslationIndex
Ign http://ftp.availo.se precise/multiverse TranslationIndex
Ign http://ftp.availo.se precise/restricted TranslationIndex
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main amd64 Packages
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Ign http://extras.ubuntu.com precise/main TranslationIndex
Ign http://ftp.availo.se precise/universe TranslationIndex
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main amd64 Packages
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main amd64 Packages
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Ign http://ftp.availo.se precise-updates/main TranslationIndex
Ign http://ftp.availo.se precise-updates/multiverse TranslationIndex
Ign http://ftp.availo.se precise-updates/restricted TranslationIndex
Ign http://ftp.availo.se precise-updates/universe TranslationIndex
Hit http://repository.spotify.com stable/non-free amd64 Packages
Ign http://ftp.availo.se precise-backports/main TranslationIndex
Ign http://ftp.availo.se precise-backports/multiverse TranslationIndex
Ign http://ftp.availo.se precise-backports/restricted TranslationIndex
Ign http://ftp.availo.se precise-backports/universe TranslationIndex
Hit http://repository.spotify.com stable/non-free i386 Packages
Ign http://archive.canonical.com precise/partner Translation-en_US
Ign http://ftp.availo.se precise-security/main TranslationIndex
Ign http://ftp.availo.se precise-security/multiverse TranslationIndex
Ign http://ftp.availo.se precise-security/restricted TranslationIndex
Ign http://ftp.availo.se precise-security/universe TranslationIndex
Ign http://repository.spotify.com stable/non-free Translation-en_US
Ign http://archive.canonical.com precise/partner Translation-en
Ign http://repository.spotify.com stable/non-free Translation-en
Ign http://extras.ubuntu.com precise/main Translation-en_US
Ign http://extras.ubuntu.com precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Err http://ftp.availo.se precise/main Sources
404 Not Found Err http://ftp.availo.se precise/restricted Sources
404 Not Found Err http://ftp.availo.se precise/universe Sources
404 Not Found Err http://ftp.availo.se precise/multiverse Sources
404 Not Found Err http://ftp.availo.se precise/main amd64 Packages
404 Not Found Err http://ftp.availo.se precise/restricted amd64 Packages
404 Not Found Err http://ftp.availo.se precise/universe amd64 Packages
404 Not Found Err http://ftp.availo.se precise/multiverse amd64 Packages
404 Not Found Err http://ftp.availo.se precise/main i386 Packages
404 Not Found Err http://ftp.availo.se precise/restricted i386 Packages
404 Not Found Err http://ftp.availo.se precise/universe i386 Packages
404 Not Found Err http://ftp.availo.se precise/multiverse i386 Packages
404 Not Found Err http://ftp.availo.se precise-updates/main Sources
404 Not Found Err http://ftp.availo.se precise-updates/restricted Sources
404 Not Found Err http://ftp.availo.se precise-updates/universe Sources
404 Not Found Err http://ftp.availo.se precise-updates/multiverse Sources
404 Not Found Err http://ftp.availo.se precise-updates/main amd64 Packages
404 Not Found Err http://ftp.availo.se precise-updates/restricted amd64 Packages
404 Not Found Err http://ftp.availo.se precise-updates/universe amd64 Packages
404 Not Found Err http://ftp.availo.se precise-updates/multiverse amd64 Packages
404 Not Found Err http://ftp.availo.se precise-updates/main i386 Packages
404 Not Found Err http://ftp.availo.se precise-updates/restricted i386 Packages
404 Not Found Err http://ftp.availo.se precise-updates/universe i386 Packages
404 Not Found Err http://ftp.availo.se precise-updates/multiverse i386 Packages
404 Not Found Err http://ftp.availo.se precise-backports/main Sources
404 Not Found Err http://ftp.availo.se precise-backports/restricted Sources
404 Not Found Err http://ftp.availo.se precise-backports/universe Sources
404 Not Found Err http://ftp.availo.se precise-backports/multiverse Sources
404 Not Found Err http://ftp.availo.se precise-backports/main amd64 Packages
404 Not Found Err http://ftp.availo.se precise-backports/restricted amd64 Packages
404 Not Found Err http://ftp.availo.se precise-backports/universe amd64 Packages
404 Not Found Err http://ftp.availo.se precise-backports/multiverse amd64 Packages
404 Not Found Err http://ftp.availo.se precise-backports/main i386 Packages
404 Not Found Err http://ftp.availo.se precise-backports/restricted i386 Packages
404 Not Found Err http://ftp.availo.se precise-backports/universe i386 Packages
404 Not Found Err http://ftp.availo.se precise-backports/multiverse i386 Packages
404 Not Found Err http://ftp.availo.se precise-security/main Sources
404 Not Found Err http://ftp.availo.se precise-security/restricted Sources
404 Not Found Err http://ftp.availo.se precise-security/universe Sources
404 Not Found Err http://ftp.availo.se precise-security/multiverse Sources
404 Not Found Err http://ftp.availo.se precise-security/main amd64 Packages
404 Not Found Err http://ftp.availo.se precise-security/restricted amd64 Packages
404 Not Found Err http://ftp.availo.se precise-security/universe amd64 Packages
404 Not Found Err http://ftp.availo.se precise-security/multiverse amd64 Packages
404 Not Found Err http://ftp.availo.se precise-security/main i386 Packages
404 Not Found Err http://ftp.availo.se precise-security/restricted i386 Packages
404 Not Found Err http://ftp.availo.se precise-security/universe i386 Packages
404 Not Found Err http://ftp.availo.se precise-security/multiverse i386 Packages
404 Not Found Ign http://ftp.availo.se precise/main Translation-en_US
Ign http://ftp.availo.se precise/main Translation-en
Ign http://ftp.availo.se precise/multiverse Translation-en_US
Ign http://ftp.availo.se precise/multiverse Translation-en
Ign http://ftp.availo.se precise/restricted Translation-en_US
Ign http://ftp.availo.se precise/restricted Translation-en
Ign http://ftp.availo.se precise/universe Translation-en_US
Ign http://ftp.availo.se precise/universe Translation-en
Ign http://ftp.availo.se precise-updates/main Translation-en_US
Ign http://ftp.availo.se precise-updates/main Translation-en
Ign http://ftp.availo.se precise-updates/multiverse Translation-en_US
Ign http://ftp.availo.se precise-updates/multiverse Translation-en
Ign http://ftp.availo.se precise-updates/restricted Translation-en_US
Ign http://ftp.availo.se precise-updates/restricted Translation-en
Ign http://ftp.availo.se precise-updates/universe Translation-en_US
Ign http://ftp.availo.se precise-updates/universe Translation-en
Ign http://ftp.availo.se precise-backports/main Translation-en_US
Ign http://ftp.availo.se precise-backports/main Translation-en
Ign http://ftp.availo.se precise-backports/multiverse Translation-en_US
Ign http://ftp.availo.se precise-backports/multiverse Translation-en
Ign http://ftp.availo.se precise-backports/restricted Translation-en_US
Ign http://ftp.availo.se precise-backports/restricted Translation-en
Ign http://ftp.availo.se precise-backports/universe Translation-en_US
Ign http://ftp.availo.se precise-backports/universe Translation-en
Ign http://ftp.availo.se precise-security/main Translation-en_US
Ign http://ftp.availo.se precise-security/main Translation-en
Ign http://ftp.availo.se precise-security/multiverse Translation-en_US
Ign http://ftp.availo.se precise-security/multiverse Translation-en
Ign http://ftp.availo.se precise-security/restricted Translation-en_US
Ign http://ftp.availo.se precise-security/restricted Translation-en
Ign http://ftp.availo.se precise-security/universe Translation-en_US
Ign http://ftp.availo.se precise-security/universe Translation-en
Fetched 2,979 B in 9s (328 B/s)
W: GPG error: http://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 082CCEDF94558F59
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/main/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/restricted/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/universe/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/multiverse/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/restricted/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/universe/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/multiverse/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/restricted/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/universe/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/multiverse/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/main/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/restricted/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/universe/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/multiverse/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/restricted/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/universe/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/multiverse/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/restricted/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/universe/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/multiverse/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/main/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/restricted/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/universe/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/multiverse/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/restricted/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/universe/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/multiverse/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/restricted/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/universe/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/multiverse/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/main/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/restricted/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/universe/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/multiverse/source/Sources 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/restricted/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/universe/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/multiverse/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/restricted/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/universe/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/multiverse/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
我将非常感激能够修复这个问题。感谢您的帮助。
答案1
最有可能的是，您选择作为软件源的特定 Ubuntu 镜像存在问题。
也许你应该尝试改变它。转到 Ubuntu 软件中心，从“编辑”菜单中选择“软件源”。你将看到一个如下所示的窗口；选择另一个“下载自”位置并尝试再次运行更新。
答案2
使用您最喜欢的文本查看器打开 /etc/apt/sources.list，然后您可以执行以下操作之一：
任何一个
通过将 /ubuntu 添加到造成问题的条目中来更正您的软件源列表。
或者
如果你不想再使用，你可以删除那些导致此问题的 ppa