当我尝试在 Ubuntu 14.04 机器上进行更新时，我注意到以下错误。我记得上次尝试时它运行正常。
sudo apt-get update
Err http://extras.ubuntu.com trusty InRelease
Err http://extras.ubuntu.com trusty Release.gpg
Cannot initiate the connection to extras.ubuntu.com:80 (2001:67c:1360:8c01::23). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::23 80]
Err http://us.archive.ubuntu.com trusty InRelease
Err http://us.archive.ubuntu.com trusty-updates InRelease
Err http://us.archive.ubuntu.com trusty-backports InRelease
Err http://us.archive.ubuntu.com trusty-proposed InRelease
Err http://us.archive.ubuntu.com trusty Release.gpg
Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) [IP: 2001:67c:1562::15 80]
Err http://us.archive.ubuntu.com trusty-updates Release.gpg
Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) [IP: 2001:67c:1562::15 80]
Err http://us.archive.ubuntu.com trusty-backports Release.gpg
Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) [IP: 2001:67c:1562::15 80]
Err http://us.archive.ubuntu.com trusty-proposed Release.gpg
Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) [IP: 2001:67c:1562::15 80]
Err http://security.ubuntu.com trusty-security InRelease
Err http://security.ubuntu.com trusty-security Release.gpg
Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::17). - connect (101: Network is unreachable) [IP: 2001:67c:1562::17 80]
Reading package lists... Done
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/InRelease
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/InRelease
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-proposed/InRelease
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/trusty/Release.gpg Cannot initiate the connection to extras.ubuntu.com:80 (2001:67c:1360:8c01::23). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::23 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) [IP: 2001:67c:1562::15 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) [IP: 2001:67c:1562::15 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/Release.gpg Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) [IP: 2001:67c:1562::15 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-proposed/Release.gpg Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) [IP: 2001:67c:1562::15 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::17). - connect (101: Network is unreachable) [IP: 2001:67c:1562::17 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.
有人可以帮我解决这个问题吗？
@TungTran：经过您建议的更改，取得了一些进展，但仍然面临一些问题，如下所示：
sudo apt-get update
Ign http://us.archive.ubuntu.com trusty InRelease
Ign http://security.ubuntu.com trusty-security InRelease
Ign http://extras.ubuntu.com trusty InRelease
Ign http://security.ubuntu.com trusty-security Release.gpg
Ign http://us.archive.ubuntu.com trusty-updates InRelease
Ign http://extras.ubuntu.com trusty Release.gpg
Ign http://security.ubuntu.com trusty-security Release
Ign http://us.archive.ubuntu.com trusty-backports InRelease
Ign http://extras.ubuntu.com trusty Release
Ign http://us.archive.ubuntu.com trusty-proposed InRelease
Ign http://us.archive.ubuntu.com trusty Release.gpg
Ign http://us.archive.ubuntu.com trusty-updates Release.gpg
Ign http://us.archive.ubuntu.com trusty-backports Release.gpg
Ign http://us.archive.ubuntu.com trusty-proposed Release.gpg
Ign http://us.archive.ubuntu.com trusty Release
Ign http://us.archive.ubuntu.com trusty-updates Release
Ign http://us.archive.ubuntu.com trusty-backports Release
Ign http://us.archive.ubuntu.com trusty-proposed Release
Err http://extras.ubuntu.com trusty/main Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://extras.ubuntu.com trusty/main i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Ign http://extras.ubuntu.com trusty/main Translation-en_US
Ign http://extras.ubuntu.com trusty/main Translation-en
Err http://security.ubuntu.com trusty-security/main Sources
404 Not Found [IP: 199.168.151.24 80]
Err http://security.ubuntu.com trusty-security/restricted Sources
404 Not Found [IP: 199.168.151.24 80]
Err http://security.ubuntu.com trusty-security/universe Sources
404 Not Found [IP: 199.168.151.24 80]
Err http://security.ubuntu.com trusty-security/multiverse Sources
404 Not Found [IP: 199.168.151.24 80]
Err http://security.ubuntu.com trusty-security/main i386 Packages
404 Not Found [IP: 199.168.151.24 80]
Err http://security.ubuntu.com trusty-security/restricted i386 Packages
404 Not Found [IP: 199.168.151.24 80]
Err http://security.ubuntu.com trusty-security/universe i386 Packages
404 Not Found [IP: 199.168.151.24 80]
Err http://security.ubuntu.com trusty-security/multiverse i386 Packages
404 Not Found [IP: 199.168.151.24 80]
Ign http://security.ubuntu.com trusty-security/main Translation-en_US
Ign http://security.ubuntu.com trusty-security/main Translation-en
Ign http://security.ubuntu.com trusty-security/multiverse Translation-en_US
Ign http://security.ubuntu.com trusty-security/multiverse Translation-en
Ign http://security.ubuntu.com trusty-security/restricted Translation-en_US
Ign http://security.ubuntu.com trusty-security/restricted Translation-en
Ign http://security.ubuntu.com trusty-security/universe Translation-en_US
Ign http://security.ubuntu.com trusty-security/universe Translation-en
Err http://us.archive.ubuntu.com trusty/main Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty/restricted Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty/universe Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty/multiverse Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty/main i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty/restricted i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty/universe i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty/multiverse i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Ign http://us.archive.ubuntu.com trusty/main Translation-en_US
Ign http://us.archive.ubuntu.com trusty/main Translation-en
Ign http://us.archive.ubuntu.com trusty/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com trusty/multiverse Translation-en
Ign http://us.archive.ubuntu.com trusty/restricted Translation-en_US
Ign http://us.archive.ubuntu.com trusty/restricted Translation-en
Ign http://us.archive.ubuntu.com trusty/universe Translation-en_US
Ign http://us.archive.ubuntu.com trusty/universe Translation-en
Err http://us.archive.ubuntu.com trusty-updates/main Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-updates/restricted Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-updates/universe Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-updates/multiverse Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-updates/main i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-updates/restricted i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-updates/universe i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-updates/multiverse i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Ign http://us.archive.ubuntu.com trusty-updates/main Translation-en_US
Ign http://us.archive.ubuntu.com trusty-updates/main Translation-en
Ign http://us.archive.ubuntu.com trusty-updates/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com trusty-updates/multiverse Translation-en
Ign http://us.archive.ubuntu.com trusty-updates/restricted Translation-en_US
Ign http://us.archive.ubuntu.com trusty-updates/restricted Translation-en
Ign http://us.archive.ubuntu.com trusty-updates/universe Translation-en_US
Ign http://us.archive.ubuntu.com trusty-updates/universe Translation-en
Err http://us.archive.ubuntu.com trusty-backports/main Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-backports/restricted Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-backports/universe Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-backports/multiverse Sources
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-backports/main i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-backports/restricted i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-backports/universe i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-backports/multiverse i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Ign http://us.archive.ubuntu.com trusty-backports/main Translation-en_US
Ign http://us.archive.ubuntu.com trusty-backports/main Translation-en
Ign http://us.archive.ubuntu.com trusty-backports/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com trusty-backports/multiverse Translation-en
Ign http://us.archive.ubuntu.com trusty-backports/restricted Translation-en_US
Ign http://us.archive.ubuntu.com trusty-backports/restricted Translation-en
Ign http://us.archive.ubuntu.com trusty-backports/universe Translation-en_US
Ign http://us.archive.ubuntu.com trusty-backports/universe Translation-en
Err http://us.archive.ubuntu.com trusty-proposed/multiverse i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-proposed/main i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-proposed/universe i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Err http://us.archive.ubuntu.com trusty-proposed/restricted i386 Packages
404 Not Found [IP: 199.168.148.24 80]
Ign http://us.archive.ubuntu.com trusty-proposed/main Translation-en_US
Ign http://us.archive.ubuntu.com trusty-proposed/main Translation-en
Ign http://us.archive.ubuntu.com trusty-proposed/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com trusty-proposed/multiverse Translation-en
Ign http://us.archive.ubuntu.com trusty-proposed/restricted Translation-en_US
Ign http://us.archive.ubuntu.com trusty-proposed/restricted Translation-en
Ign http://us.archive.ubuntu.com trusty-proposed/universe Translation-en_US
Ign http://us.archive.ubuntu.com trusty-proposed/universe Translation-en
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/main/source/Sources 404 Not Found [IP: 199.168.151.24 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/restricted/source/Sources 404 Not Found [IP: 199.168.151.24 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/universe/source/Sources 404 Not Found [IP: 199.168.151.24 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/multiverse/source/Sources 404 Not Found [IP: 199.168.151.24 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/main/binary-i386/Packages 404 Not Found [IP: 199.168.151.24 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/restricted/binary-i386/Packages 404 Not Found [IP: 199.168.151.24 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/universe/binary-i386/Packages 404 Not Found [IP: 199.168.151.24 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/multiverse/binary-i386/Packages 404 Not Found [IP: 199.168.151.24 80]
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/trusty/main/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/main/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/restricted/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/universe/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/multiverse/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/restricted/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/universe/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/multiverse/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/source/Sources 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-proposed/multiverse/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-proposed/main/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-proposed/universe/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-proposed/restricted/binary-i386/Packages 404 Not Found [IP: 199.168.148.24 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
这是我的 sources.list 的内容
cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta i386 (20150805)]/ trusty main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty universe
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
deb http://security.ubuntu.com/ubuntu trusty-security universe
deb-src http://security.ubuntu.com/ubuntu trusty-security universe
deb http://security.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu trusty partner
# deb-src http://archive.canonical.com/ubuntu trusty partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu trusty main
deb http://us.archive.ubuntu.com/ubuntu/ trusty-proposed multiverse main universe restricted
deb-src http://extras.ubuntu.com/ubuntu trusty main
答案1
创建/etc/apt/apt.conf以添加 APT 的代理配置。
sudo nano /etc/apt/apt.conf
将此行添加到您的/etc/apt/apt.conf文件中
Acquire::http::Proxy "http://proxyaddress:proxyport";
使用Ctrl+保存X并重Y试：
sudo apt-get update