当我尝试通过 Software Updater 进行更新时，出现以下错误：
当然，人们通常会用（正如我之前在这里问过的那样）解决这个问题：
sudo apt-get update && sudo apt-get upgrade
但是，这只会产生自己的错误：
E: Some index files failed to download. They have been ignored, or old
ones used instead.
我认为这可能与某种连接问题有关，但无论我的 VPN 是否正在运行，我都会收到相同的错误......更不用说其他一切都没有连接问题了。
任何帮助，将不胜感激...
顺便说一句，这是完整的终端演说：
Hit http://repo.steampowered.com precise InRelease
Ign http://extras.ubuntu.com trusty InRelease
Ign http://download.opensuse.org InRelease
Ign http://old-releases.ubuntu.com raring InRelease
Ign http://dl.google.com stable InRelease
Get:1 http://repository.spotify.com stable InRelease [3,300 B]
Ign http://ppa.launchpad.net trusty InRelease
Ign http://repository.spotify.com stable InRelease
Ign http://security.ubuntu.com trusty-security InRelease
Hit http://repo.steampowered.com precise/steam Sources
Hit http://extras.ubuntu.com trusty Release.gpg
Ign http://download.opensuse.org InRelease
Hit http://old-releases.ubuntu.com raring Release.gpg
Ign http://repository.spotify.com stable/non-free amd64
Packages/DiffIndex Hit http://dl.google.com stable Release.gpg
Ign http://ppa.launchpad.net trusty InRelease
Hit http://security.ubuntu.com trusty-security Release.gpg
Hit http://extras.ubuntu.com trusty Release
Hit http://download.opensuse.org Release.gpg
Ign http://repository.spotify.com stable/non-free i386
Packages/DiffIndex Hit http://old-releases.ubuntu.com raring
Release Hit http://dl.google.com stable
Release Ign
http://ppa.launchpad.net trusty InRelease
Ign http://au.archive.ubuntu.com trusty InRelease
Hit http://security.ubuntu.com trusty-security Release
Hit http://repo.steampowered.com precise/steam amd64 Packages
Hit http://extras.ubuntu.com trusty/main Sources
Hit http://download.opensuse.org Release.gpg
Hit http://old-releases.ubuntu.com raring/main amd64 Packages
Ign http://ppa.launchpad.net trusty InRelease
Hit http://dl.google.com stable/main amd64 Packages
Hit http://security.ubuntu.com trusty-security/main Sources
Hit http://extras.ubuntu.com trusty/main amd64 Packages
Hit http://download.opensuse.org Release
Hit http://old-releases.ubuntu.com raring/restricted amd64 Packages
Ign http://ppa.launchpad.net trusty InRelease
Hit http://dl.google.com stable/main i386 Packages
Ign http://au.archive.ubuntu.com trusty-updates InRelease
Hit http://repo.steampowered.com precise/steam i386 Packages
Hit http://extras.ubuntu.com trusty/main i386 Packages
Hit http://download.opensuse.org Release
Hit http://old-releases.ubuntu.com raring/universe amd64 Packages
Hit http://security.ubuntu.com trusty-security/restricted Sources
Ign http://ppa.launchpad.net trusty InRelease
Hit http://download.opensuse.org Packages
Ign http://au.archive.ubuntu.com trusty-backports InRelease
Hit http://old-releases.ubuntu.com raring/multiverse amd64 Packages
Ign http://ppa.launchpad.net trusty InRelease
Hit http://security.ubuntu.com trusty-security/universe Sources
Hit http://old-releases.ubuntu.com raring/main i386 Packages
Ign http://ppa.launchpad.net trusty InRelease
Hit http://security.ubuntu.com trusty-security/multiverse Sources
Ign http://au.archive.ubuntu.com trusty Release.gpg
Hit http://old-releases.ubuntu.com raring/restricted i386 Packages
Ign http://ppa.launchpad.net trusty InRelease
Hit http://security.ubuntu.com trusty-security/main amd64 Packages
Hit http://old-releases.ubuntu.com raring/universe i386 Packages
Hit http://download.opensuse.org Packages
Ign http://ppa.launchpad.net trusty InRelease
Ign http://au.archive.ubuntu.com trusty-updates Release.gpg
Hit http://security.ubuntu.com trusty-security/restricted amd64
Packages Hit http://old-releases.ubuntu.com raring/multiverse
i386 Packages Ign http://ppa.launchpad.net trusty
InRelease Hit
http://security.ubuntu.com trusty-security/universe amd64 Packages
Hit http://old-releases.ubuntu.com raring/main Translation-en_AU
Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://au.archive.ubuntu.com trusty-backports Release.gpg
Hit http://old-releases.ubuntu.com raring/main Translation-en
Hit http://security.ubuntu.com trusty-security/multiverse amd64
Packages Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://au.archive.ubuntu.com trusty Release
Hit http://old-releases.ubuntu.com raring/multiverse Translation-en_AU
Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://security.ubuntu.com trusty-security/main i386 Packages
Ign http://dl.google.com stable/main Translation-en_AU
Ign http://extras.ubuntu.com trusty/main Translation-en_AU
Hit http://old-releases.ubuntu.com raring/multiverse Translation-en
Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://dl.google.com stable/main Translation-en
Hit http://security.ubuntu.com trusty-security/restricted i386
Packages Ign http://au.archive.ubuntu.com trusty-updates
Release Ign http://extras.ubuntu.com
trusty/main Translation-en Hit
http://old-releases.ubuntu.com raring/restricted Translation-en_AU
Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://security.ubuntu.com trusty-security/universe i386 Packages
Hit http://old-releases.ubuntu.com raring/restricted Translation-en
Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://au.archive.ubuntu.com trusty-backports Release
Hit http://repository.spotify.com stable/non-free amd64 Packages
Hit http://security.ubuntu.com trusty-security/multiverse i386
Packages Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://repository.spotify.com stable/non-free i386 Packages
Ign http://au.archive.ubuntu.com trusty/main Sources/DiffIndex
Hit http://security.ubuntu.com trusty-security/main Translation-en
Get:2 http://ppa.launchpad.net trusty Release.gpg [316 B]
Ign http://repository.spotify.com stable/non-free Translation-en_AU
Hit http://old-releases.ubuntu.com raring/universe Translation-en
Hit http://security.ubuntu.com trusty-security/multiverse
Translation-en Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://repository.spotify.com stable/non-free Translation-en
Ign http://au.archive.ubuntu.com trusty/restricted Sources/DiffIndex
Hit http://security.ubuntu.com trusty-security/restricted
Translation-en Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://au.archive.ubuntu.com trusty/universe Sources/DiffIndex
Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://security.ubuntu.com trusty-security/universe Translation-en
Ign http://old-releases.ubuntu.com raring/universe Translation-en_AU
Ign http://au.archive.ubuntu.com trusty/multiverse Sources/DiffIndex
Hit http://ppa.launchpad.net trusty Release
Ign http://repo.steampowered.com precise/steam Translation-en_AU
Hit http://ppa.launchpad.net trusty Release
Ign http://au.archive.ubuntu.com trusty/main amd64 Packages/DiffIndex
Ign http://repo.steampowered.com precise/steam Translation-en
Ign http://download.opensuse.org Translation-en_AU
Hit http://ppa.launchpad.net trusty Release
Ign http://download.opensuse.org Translation-en
Hit http://ppa.launchpad.net trusty Release
Ign http://au.archive.ubuntu.com trusty/restricted amd64
Packages/DiffIndex Ign http://download.opensuse.org
Translation-en_AU Hit
http://ppa.launchpad.net trusty Release
Ign http://au.archive.ubuntu.com trusty/universe amd64
Packages/DiffIndex Ign http://download.opensuse.org
Translation-en Hit
http://ppa.launchpad.net trusty Release
Hit http://ppa.launchpad.net trusty Release
Ign http://au.archive.ubuntu.com trusty/multiverse amd64
Packages/DiffIndex Hit http://ppa.launchpad.net trusty Release
Ign http://ppa.launchpad.net trusty Release
Hit http://ppa.launchpad.net trusty Release
Ign http://au.archive.ubuntu.com trusty/main i386 Packages/DiffIndex
Hit http://ppa.launchpad.net trusty Release
Ign http://au.archive.ubuntu.com trusty/restricted i386
Packages/DiffIndex Hit http://ppa.launchpad.net trusty Release
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Ign http://au.archive.ubuntu.com trusty/universe i386
Packages/DiffIndex Hit http://ppa.launchpad.net trusty/main
i386 Packages Hit http://ppa.launchpad.net
trusty/main Translation-en Ign
http://au.archive.ubuntu.com trusty/multiverse i386 Packages/DiffIndex
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Ign http://au.archive.ubuntu.com trusty-updates/main Sources/DiffIndex
Hit http://ppa.launchpad.net trusty/main i386 Packages
Ign http://au.archive.ubuntu.com trusty-updates/restricted
Sources/DiffIndex Hit http://ppa.launchpad.net trusty/main
Translation-en Ign http://ppa.launchpad.net
trusty/main amd64 Packages/DiffIndex Ign
http://au.archive.ubuntu.com trusty-updates/universe Sources/DiffIndex
Ign http://ppa.launchpad.net trusty/main i386 Packages/DiffIndex
Ign http://au.archive.ubuntu.com trusty-updates/multiverse
Sources/DiffIndex Ign http://au.archive.ubuntu.com
trusty-updates/main amd64 Packages/DiffIndex Hit
http://ppa.launchpad.net trusty/main amd64 Packages
Ign http://au.archive.ubuntu.com trusty-updates/restricted amd64
Packages/DiffIndex Hit http://ppa.launchpad.net trusty/main i386
Packages Hit http://ppa.launchpad.net
trusty/main Translation-en Ign
http://au.archive.ubuntu.com trusty-updates/universe amd64
Packages/DiffIndex Hit http://ppa.launchpad.net trusty/main amd64
Packages Ign http://au.archive.ubuntu.com
trusty-updates/multiverse amd64 Packages/DiffIndex Hit
http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Ign http://au.archive.ubuntu.com trusty-updates/main i386
Packages/DiffIndex Hit http://ppa.launchpad.net trusty/main amd64
Packages Hit http://ppa.launchpad.net
trusty/main i386 Packages Ign
http://au.archive.ubuntu.com trusty-updates/restricted i386
Packages/DiffIndex Hit http://ppa.launchpad.net trusty/main
Translation-en Hit http://ppa.launchpad.net
trusty/main amd64 Packages Ign
http://au.archive.ubuntu.com trusty-updates/universe i386
Packages/DiffIndex Hit http://ppa.launchpad.net trusty/main i386
Packages Ign http://au.archive.ubuntu.com
trusty-updates/multiverse i386 Packages/DiffIndex Ign
http://ppa.launchpad.net trusty/main Translation-en_AU
Ign http://ppa.launchpad.net trusty/main Translation-en
Ign http://au.archive.ubuntu.com trusty-backports/main
Sources/DiffIndex Ign http://au.archive.ubuntu.com
trusty-backports/restricted Sources/DiffIndex Ign
http://au.archive.ubuntu.com trusty-backports/universe
Sources/DiffIndex Ign http://au.archive.ubuntu.com
trusty-backports/multiverse Sources/DiffIndex Ign
http://au.archive.ubuntu.com trusty-backports/main amd64
Packages/DiffIndex Ign http://au.archive.ubuntu.com
trusty-backports/restricted amd64 Packages/DiffIndex Ign
http://au.archive.ubuntu.com trusty-backports/universe amd64
Packages/DiffIndex Ign http://au.archive.ubuntu.com
trusty-backports/multiverse amd64 Packages/DiffIndex Ign
http://au.archive.ubuntu.com trusty-backports/main i386
Packages/DiffIndex Ign http://au.archive.ubuntu.com
trusty-backports/restricted i386 Packages/DiffIndex Ign
http://au.archive.ubuntu.com trusty-backports/universe i386
Packages/DiffIndex Ign http://au.archive.ubuntu.com
trusty-backports/multiverse i386 Packages/DiffIndex Ign
http://au.archive.ubuntu.com trusty/main Translation-en_AU Ign
http://au.archive.ubuntu.com trusty/main Translation-en Ign
http://au.archive.ubuntu.com trusty/multiverse Translation-en_AU Ign
http://au.archive.ubuntu.com trusty/multiverse Translation-en Ign
http://au.archive.ubuntu.com trusty/restricted Translation-en_AU Ign
http://au.archive.ubuntu.com trusty/restricted Translation-en Ign
http://au.archive.ubuntu.com trusty/universe Translation-en_AU Ign
http://au.archive.ubuntu.com trusty/universe Translation-en Ign
http://au.archive.ubuntu.com trusty-updates/main Translation-en_AU Ign
http://au.archive.ubuntu.com trusty-updates/main Translation-en Ign
http://au.archive.ubuntu.com trusty-updates/multiverse
Translation-en_AU Ign http://au.archive.ubuntu.com
trusty-updates/multiverse Translation-en Ign
http://au.archive.ubuntu.com trusty-updates/restricted
Translation-en_AU Ign http://au.archive.ubuntu.com
trusty-updates/restricted Translation-en Ign
http://au.archive.ubuntu.com trusty-updates/universe Translation-en_AU
Ign http://au.archive.ubuntu.com trusty-updates/universe
Translation-en Ign http://au.archive.ubuntu.com trusty-backports/main
Translation-en_AU Ign http://au.archive.ubuntu.com
trusty-backports/main Translation-en Ign http://au.archive.ubuntu.com
trusty-backports/multiverse Translation-en_AU Ign
http://au.archive.ubuntu.com trusty-backports/multiverse
Translation-en Ign http://au.archive.ubuntu.com
trusty-backports/restricted Translation-en_AU Ign
http://au.archive.ubuntu.com trusty-backports/restricted
Translation-en Ign http://au.archive.ubuntu.com
trusty-backports/universe Translation-en_AU Ign
http://au.archive.ubuntu.com trusty-backports/universe Translation-en
Err http://au.archive.ubuntu.com trusty/main Sources 404 Not Found
[IP: 202.158.214.106 80] Err http://au.archive.ubuntu.com
trusty/restricted Sources 404 Not Found [IP: 202.158.214.106 80]
Err http://au.archive.ubuntu.com trusty/universe Sources 404 Not
Found [IP: 202.158.214.106 80] Err http://au.archive.ubuntu.com
trusty/multiverse Sources 404 Not Found [IP: 202.158.214.106 80]
Err http://au.archive.ubuntu.com trusty/main amd64 Packages 404 Not
Found [IP: 202.158.214.106 80] Err http://au.archive.ubuntu.com
trusty/restricted amd64 Packages 404 Not Found [IP: 202.158.214.106
80] Err http://au.archive.ubuntu.com trusty/universe amd64 Packages
404 Not Found [IP: 202.158.214.106 80] Err
http://au.archive.ubuntu.com trusty/multiverse amd64 Packages 404
Not Found [IP: 202.158.214.106 80] Err http://au.archive.ubuntu.com
trusty/main i386 Packages 404 Not Found [IP: 202.158.214.106 80]
Err http://au.archive.ubuntu.com trusty/restricted i386 Packages 404
Not Found [IP: 202.158.214.106 80] Err http://au.archive.ubuntu.com
trusty/universe i386 Packages 404 Not Found [IP: 202.158.214.106
80] Err http://au.archive.ubuntu.com trusty/multiverse i386 Packages
404 Not Found [IP: 202.158.214.106 80] Err
http://au.archive.ubuntu.com trusty-updates/main Sources 404 Not
Found [IP: 202.158.214.106 80] Err http://au.archive.ubuntu.com
trusty-updates/restricted Sources 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-updates/universe Sources 404 Not Found [IP: 202.158.214.106
80] Err http://au.archive.ubuntu.com trusty-updates/multiverse Sources
404 Not Found [IP: 202.158.214.106 80] Err
http://au.archive.ubuntu.com trusty-updates/main amd64 Packages 404
Not Found [IP: 202.158.214.106 80] Err http://au.archive.ubuntu.com
trusty-updates/restricted amd64 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-updates/universe amd64 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-updates/multiverse amd64 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-updates/main i386 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-updates/restricted i386 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-updates/universe i386 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-updates/multiverse i386 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/main Sources 404 Not Found [IP: 202.158.214.106
80] Err http://au.archive.ubuntu.com trusty-backports/restricted
Sources 404 Not Found [IP: 202.158.214.106 80] Err
http://au.archive.ubuntu.com trusty-backports/universe Sources 404
Not Found [IP: 202.158.214.106 80] Err http://au.archive.ubuntu.com
trusty-backports/multiverse Sources 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/main amd64 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/restricted amd64 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/universe amd64 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/multiverse amd64 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/main i386 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/restricted i386 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/universe i386 Packages 404 Not Found [IP:
202.158.214.106 80] Err http://au.archive.ubuntu.com trusty-backports/multiverse i386 Packages 404 Not Found [IP:
202.158.214.106 80] Fetched 3,616 B in 4min 28s (13 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 13B00F1FD2C19886 W: GPG error:
http://ppa.launchpad.net trusty Release: The following signatures
couldn't be verified because the public key is not available:
NO_PUBKEY 4DF9B28CA252A784 W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/main/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/restricted/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/universe/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/multiverse/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/main/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/restricted/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/universe/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/multiverse/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/main/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/restricted/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/universe/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty/multiverse/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/source/Sources
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/binary-amd64/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
W: Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/binary-i386/Packages
404 Not Found [IP: 202.158.214.106 80]
E: Some index files failed to download. They have been ignored, or old
ones used instead.
http://au.archive.ubuntu.com已关闭，出于某种古怪的原因在 redhat 服务器上运行 :)
暂时切换到不同的镜像或稍后重试。
Search for "software" in your dash and click on Software & Updates.
Click on the drop-down menu for Download From and select other.
Then, click on select best server to automatically select the best server or you can just click on main server instead but it probably won't be as fast.
You can contact the maintainer of the mirror here http://aarnet.edu.au/contact-us/enquiry-and-feedback-form to let them know the repo is down.
UPDATE:
http://au.archive.ubuntu.com appears to be back up again and Software Updater should run ok.
You could try this:
and then do this
and you might could update again, and it might work fine this way.