系统：Ubuntu 12.04.4 LTS，服务器
我无法使用 apt-get 更新 openjdk7 和 6。它总是以这个失败结束：
Err http://security.ubuntu.com/ubuntu/ precise-security/main openjdk-6-jre-headl
Connection failed [IP: 91.189.91.13 80]
Err http://ch.archive.ubuntu.com/ubuntu/ precise-updates/main openjdk-6-jdk amd6
Connection failed
Err http://security.ubuntu.com/ubuntu/ precise-security/main openjdk-6-jdk amd64 6b32-1.13.4-4ubuntu0.12.04.2
Connection failed [IP: 91.189.91.15 80]
Fetched 195 MB in 20min 31s (158 kB/s)
Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/o/openjdk-7/openjdk-7-jdk_7u65-2.5.1-4ubuntu1~0.12.04.2_amd64.deb Connection failed [IP: 91.189.88.149 80]
Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjdk-6/openjdk-6-jre-headless_6b32-1.13.4-4ubuntu0.12.04.2_amd64.deb Connection failed [IP: 91.189.91.13 80]
Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjdk-6/openjdk-6-jdk_6b32-1.13.4-4ubuntu0.12.04.2_amd64.deb Connection failed [IP: 91.189.91.15 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
互联网连接正常，其他数据包安装运行良好。
我的 /etc/apt/sources.lists 自安装以来就没有被触碰过：
# deb cdrom:[Ubuntu-Server 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130214)]/ dists/precise/main/binary-i386/
# deb cdrom:[Ubuntu-Server 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130214)]/ dists/precise/restricted/binary-i386/
# deb cdrom:[Ubuntu-Server 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130214)]/ precise main restricted
# deb cdrom:[Ubuntu-Server 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130214)]/ dists/precise/main/binary-i386/
# deb cdrom:[Ubuntu-Server 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130214)]/ dists/precise/restricted/binary-i386/
# deb cdrom:[Ubuntu-Server 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130214)]/ precise main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ch.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://ch.archive.ubuntu.com/ubuntu/ precise main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://ch.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://ch.archive.ubuntu.com/ubuntu/ precise-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://ch.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://ch.archive.ubuntu.com/ubuntu/ precise universe
deb http://ch.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://ch.archive.ubuntu.com/ubuntu/ precise-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://ch.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://ch.archive.ubuntu.com/ubuntu/ precise multiverse
deb http://ch.archive.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://ch.archive.ubuntu.com/ubuntu/ precise-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://ch.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://ch.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-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 precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner
## Uncomment the following two lines to add software from Ubuntu's
## 'extras' repository.
## 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 precise main
# deb-src http://extras.ubuntu.com/ubuntu precise main
答案1
看来您需要更新 sources.list。为此，请运行：
sudo apt-get update
然后继续标准安装。