“无法获取”404 Not Found，为什么？
hdaf@neoLaptop:~$ sudo apt-get update [sudo] password for hdaf: Ign http*//extras.ubuntu.com saucy InRelease Ign http*//ppa.launchpad.net saucy InRelease Ign http*//archive.canonical.com saucy InRelease Ign http*//archive.ubuntu.com saucy InRelease Ign http*//extras.ubuntu.com saucy InRelease Ign http*//ppa.launchpad.net saucy InRelease Ign http*//archive.canonical.com saucy InRelease Ign http*//archive.ubuntu.com saucy-updates InRelease Ign http*//ppa.launchpad.net saucy InRelease Get:1 http*//extras.ubuntu.com saucy Release.gpg [72 B] Ign http*//archive.canonical.com saucy InRelease Ign http*//archive.ubuntu.com saucy-backports InRelease Ign http*//ppa.launchpad.net saucy Release.gpg Ign http*//extras.ubuntu.com saucy Release.gpg Get:2 http*//archive.canonical.com saucy Release.gpg [933 B] Ign http*//archive.ubuntu.com saucy-security InRelease Get:3 http*//ppa.launchpad.net saucy Release.gpg [316 B] Hit http*//extras.ubuntu.com saucy Release Get:4 http*//archive.ubuntu.com saucy Release.gpg [933 B] Get:5 http*//archive.canonical.com saucy Release.gpg [933 B] Get:6 http*//ppa.launchpad.net saucy Release.gpg [316 B] Ign http*//extras.ubuntu.com saucy Release Ign http*//ppa.launchpad.net saucy Release Get:7 http*//archive.ubuntu.com saucy-updates Release.gpg [933 B] Ign http*//archive.canonical.com saucy Release.gpg Hit http*//extras.ubuntu.com saucy/main Sources Hit http*//ppa.launchpad.net saucy Release Get:8 http*//archive.ubuntu.com saucy-backports Release.gpg [933 B] Hit http*//extras.ubuntu.com saucy/main amd64 Packages Get:9 http*//archive.canonical.com saucy Release [5916 B] Hit http*//ppa.launchpad.net saucy Release Hit http*//extras.ubuntu.com saucy/main i386 Packages Get:10 http*//archive.ubuntu.com saucy-security Release.gpg [933 B] Hit http*//archive.canonical.com saucy Release Hit http*//archive.ubuntu.com saucy Release Ign http*//archive.canonical.com saucy Release Get:11 http*//archive.ubuntu.com saucy-updates Release [49,6 kB] Get:12 http*//archive.canonical.com saucy/partner Sources [1290 B] Get:13 http*//archive.canonical.com saucy/partner amd64 Packages [693 B] Get:14 http*//archive.canonical.com saucy/partner i386 Packages [1883 B] Hit http*//archive.ubuntu.com saucy-backports Release Get:15 http*//archive.ubuntu.com saucy-security Release [49,6 kB] Get:16 http*//archive.canonical.com saucy/partner Sources [1290 B] Get:17 http*//ppa.launchpad.net saucy/main Sources [727 B] Hit http*//archive.canonical.com saucy/partner amd64 Packages Hit http*//ppa.launchpad.net saucy/main amd64 Packages Hit http*//archive.ubuntu.com saucy/restricted amd64 Packages Hit http*//ppa.launchpad.net saucy/main i386 Packages Hit http*//archive.canonical.com saucy/partner i386 Packages Hit http*//archive.ubuntu.com saucy/main amd64 Packages Hit http*//archive.ubuntu.com saucy/universe amd64 Packages Get:18 http*//ppa.launchpad.net saucy/main Sources [3336 B] Hit http*//archive.ubuntu.com saucy/multiverse amd64 Packages Hit http*//archive.ubuntu.com saucy/restricted i386 Packages Hit http*//ppa.launchpad.net saucy/main amd64 Packages Hit http*//archive.ubuntu.com saucy/main i386 Packages Hit http*//ppa.launchpad.net saucy/main i386 Packages Hit http*//archive.ubuntu.com saucy/universe i386 Packages Hit http*//archive.ubuntu.com saucy/multiverse i386 Packages Hit http*//archive.ubuntu.com saucy/main Translation-en Hit http*//archive.ubuntu.com saucy/multiverse Translation-en Hit http*//archive.ubuntu.com saucy/restricted Translation-en Hit http*//archive.ubuntu.com saucy/universe Translation-en Get:19 http*//archive.ubuntu.com saucy-updates/restricted amd64 Packages [14 B] Get:20 http*//archive.ubuntu.com saucy-updates/main amd64 Packages [49,4 kB] Get:21 http*//archive.ubuntu.com saucy-updates/universe amd64 Packages [18,1 kB] Get:22 http*//archive.ubuntu.com saucy-updates/multiverse amd64 Packages [14 B] Get:23 http*//archive.ubuntu.com saucy-updates/restricted i386 Packages [14 B] Get:24 http*//archive.ubuntu.com saucy-updates/main i386 Packages [49,1 kB] Get:25 http*//archive.ubuntu.com saucy-updates/universe i386 Packages [18,1 kB] Get:26 http*//archive.ubuntu.com saucy-updates/multiverse i386 Packages [14 B] Ign http*//extras.ubuntu.com saucy/main Translation-en_US Get:27 http*//archive.ubuntu.com saucy-updates/main Translation-en [20,5 kB] Ign http*//extras.ubuntu.com saucy/main Translation-en Err http*//extras.ubuntu.com saucy/main Sources 404 Not Found Err http*//extras.ubuntu.com saucy/source Sources 404 Not Found Hit http*//archive.ubuntu.com saucy-updates/multiverse Translation-en Err http*//extras.ubuntu.com saucy/main amd64 Packages 404 Not Found Err http*//ppa.launchpad.net saucy/main amd64 Packages 404 Not Found Err http*//extras.ubuntu.com saucy/source amd64 Packages 404 Not Found Hit http*//archive.ubuntu.com saucy-updates/restricted Translation-en Err http*//ppa.launchpad.net saucy/source amd64 Packages 404 Not Found Err http*//extras.ubuntu.com saucy/main i386 Packages 404 Not Found Err http*//ppa.launchpad.net saucy/main i386 Packages 404 Not Found Err http*//extras.ubuntu.com saucy/source i386 Packages 404 Not Found Err http*//ppa.launchpad.net saucy/source i386 Packages 404 Not Found Get:28 http*//archive.ubuntu.com saucy-updates/universe Translation-en [10,7 kB] Ign http*//extras.ubuntu.com saucy/main Translation-en_US Ign http*//ppa.launchpad.net saucy/main Translation-en_US Ign http*//extras.ubuntu.com saucy/main Translation-en Ign http*//ppa.launchpad.net saucy/main Translation-en Hit http*//archive.ubuntu.com saucy-backports/restricted amd64 Packages Ign http*//extras.ubuntu.com saucy/source Translation-en_US Ign http*//ppa.launchpad.net saucy/source Translation-en_US Hit http*//archive.ubuntu.com saucy-backports/universe amd64 Packages Ign http*//extras.ubuntu.com saucy/source Translation-en Hit http*//archive.ubuntu.com saucy-backports/multiverse amd64 Packages Ign http*//ppa.launchpad.net saucy/source Translation-en Hit http*//archive.ubuntu.com saucy-backports/main amd64 Packages Ign http*//ppa.launchpad.net saucy/main Translation-en_US Hit http*//archive.ubuntu.com saucy-backports/restricted i386 Packages Ign http*//ppa.launchpad.net saucy/main Translation-en Ign http*//ppa.launchpad.net saucy/main Translation-en_US Hit http*//archive.ubuntu.com saucy-backports/universe i386 Packages Ign http*//ppa.launchpad.net saucy/main Translation-en Hit http*//archive.ubuntu.com saucy-backports/multiverse i386 Packages Hit http*//archive.ubuntu.com saucy-backports/main i386 Packages Hit http*//archive.ubuntu.com saucy-backports/main Translation-en Hit http*//archive.ubuntu.com saucy-backports/multiverse Translation-en Hit http*//archive.ubuntu.com saucy-backports/restricted Translation-en Hit http*//archive.ubuntu.com saucy-backports/universe Translation-en Get:29 http*//archive.ubuntu.com saucy-security/restricted amd64 Packages [14 B] Get:30 http*//archive.ubuntu.com saucy-security/main amd64 Packages [23,6 kB] Ign http*//archive.canonical.com saucy/partner Translation-en_US Ign http*//archive.canonical.com saucy/partner Translation-en Get:31 http*//archive.ubuntu.com saucy-security/universe amd64 Packages [4010 B] Ign http*//archive.canonical.com saucy/partner Translation-en_US Get:32 http*//archive.ubuntu.com saucy-security/multiverse amd64 Packages [14 B] Ign http*//archive.canonical.com saucy/partner Translation-en Get:33 http*//archive.ubuntu.com saucy-security/restricted i386 Packages [14 B] Err http*//archive.canonical.com saucy/saucy Sources 404 Not Found Get:34 http*//archive.ubuntu.com saucy-security/main i386 Packages [23,6 kB] Err http*//archive.canonical.com saucy/partner Sources 404 Not Found Err http*//archive.canonical.com saucy/source Sources 404 Not Found Get:35 http*//archive.ubuntu.com saucy-security/universe i386 Packages [4033 B] Err http*//archive.canonical.com saucy/partner amd64 Packages 404 Not Found Get:36 http*//archive.ubuntu.com saucy-security/multiverse i386 Packages [14 B] Err http*//archive.canonical.com saucy/source amd64 Packages 404 Not Found Err http*//archive.canonical.com saucy/partner i386 Packages 404 Not Found Hit http*//archive.ubuntu.com saucy-security/main Translation-en Err http*//archive.canonical.com saucy/source i386 Packages 404 Not Found Ign http*//archive.canonical.com saucy/partner Translation-en_US Hit http*//archive.ubuntu.com saucy-security/multiverse Translation-en Ign http*//archive.canonical.com saucy/partner Translation-en Hit http*//archive.ubuntu.com saucy-security/restricted Translation-en Ign http*//archive.canonical.com saucy/source Translation-en_US Ign http*//archive.canonical.com saucy/source Translation-en Hit http*//archive.ubuntu.com saucy-security/universe Translation-en Ign http*//archive.ubuntu.com saucy/main Translation-en_US Ign http*//archive.ubuntu.com saucy/multiverse Translation-en_US Ign http*//archive.ubuntu.com saucy/restricted Translation-en_US Ign http*//archive.ubuntu.com saucy/universe Translation-en_US Ign http*//archive.ubuntu.com saucy-updates/main Translation-en_US Ign http*//archive.ubuntu.com saucy-updates/multiverse Translation-en_US Ign http*//archive.ubuntu.com saucy-updates/restricted Translation-en_US Ign http*//archive.ubuntu.com saucy-updates/universe Translation-en_US Ign http*//archive.ubuntu.com saucy-backports/main Translation-en_US Ign http*//archive.ubuntu.com saucy-backports/multiverse Translation-en_US Ign http*//archive.ubuntu.com saucy-backports/restricted Translation-en_US Ign http*//archive.ubuntu.com saucy-backports/universe Translation-en_US Ign http*//archive.ubuntu.com saucy-security/main Translation-en_US Ign http*//archive.ubuntu.com saucy-security/multiverse Translation-en_US Ign http*//archive.ubuntu.com saucy-security/restricted Translation-en_US Ign http*//archive.ubuntu.com saucy-security/universe Translation-en_US Fetched 342 kB in 20s (16,7 kB/s) W: Failed to fetch http*//extras.ubuntu.com/ubuntu/dists/dists/saucy/main/source/Sources 404 Not Found W: Failed to fetch http*//extras.ubuntu.com/ubuntu/dists/dists/saucy/source/source/Sources 404 Not Found W: Failed to fetch http*//extras.ubuntu.com/ubuntu/dists/dists/saucy/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http*//extras.ubuntu.com/ubuntu/dists/dists/saucy/source/binary-amd64/Packages 404 Not Found W: Failed to fetch http*//extras.ubuntu.com/ubuntu/dists/dists/saucy/main/binary-i386/Packages 404 Not Found W: Failed to fetch http*//extras.ubuntu.com/ubuntu/dists/dists/saucy/source/binary-i386/Packages 404 Not Found W: Failed to fetch http*//ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/dists/saucy/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http*//ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/dists/saucy/source/binary-amd64/Packages 404 Not Found W: Failed to fetch http*//ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/dists/saucy/main/binary-i386/Packages 404 Not Found W: Failed to fetch http*//ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/dists/saucy/source/binary-i386/Packages 404 Not Found W: Failed to fetch http*//archive.canonical.com/ubuntu/dists/dists/saucy/saucy/source/Sources 404 Not Found W: Failed to fetch http*//archive.canonical.com/ubuntu/dists/dists/saucy/partner/source/Sources 404 Not Found W: Failed to fetch http*//archive.canonical.com/ubuntu/dists/dists/saucy/source/source/Sources 404 Not Found W: Failed to fetch http*//archive.canonical.com/ubuntu/dists/dists/saucy/partner/binary-amd64/Packages 404 Not Found W: Failed to fetch http*//archive.canonical.com/ubuntu/dists/dists/saucy/source/binary-amd64/Packages 404 Not Found W: Failed to fetch http*//archive.canonical.com/ubuntu/dists/dists/saucy/partner/binary-i386/Packages 404 Not Found W: Failed to fetch http*//archive.canonical.com/ubuntu/dists/dists/saucy/source/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. 无法获取http://extras.ubuntu.com/ubuntu/dists / dists / saucy / main / source / Sources
存储库没有这样的路径。 你应该找一个类似于的条目：
deb http://extras.ubuntu.com/ubuntu/dists/ saucy main
注意url中的结束dists 。 删除所有这些行。 或者，如果你想要，你可以使用sed一次性修复线条。
sudo sed -i 's/\/dists//g' /etc/apt/sources.list /etc/apt/sources.list.d/*.list