在ubuntu下执行sudo apt-get update 异常Err http://security.ubuntu.com precise-security InReleaseErr

本文详细介绍了在Ubuntu系统中遇到apt-get update错误时的解决方案,包括修改sources.list文件使用阿里云镜像源,以及正确配置DNS服务器来解决网络连接问题。
Err http://security.ubuntu.com precise-security InReleaseErr http://security.ubuntu.com precise-security Release.gpg  Temporary failure resolving 'security.ubuntu.com'Err http://cn.archive.ubuntu.com precise InReleaseErr http://cn.archive.ubuntu.com precise-updates InReleaseErr http://cn.archive.ubuntu.com precise-backports InReleaseErr http://cn.archive.ubuntu.com precise Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'Err http://cn.archive.ubuntu.com precise-updates Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'Err http://cn.archive.ubuntu.com precise-backports Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'Reading package lists... DoneW: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise/InRelease  W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease  W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise-backports/InRelease  W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/InRelease  W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/Release.gpg  Temporary failure resolving 'security.ubuntu.com'W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise-backports/Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'W: Some index files failed to download. They have been ignored, or old ones used instead.

一般都会推荐使用国内的镜像源,比如163或者阿里云的镜像服务器 
将下列文本添加到/etc/apt/sources.list文件里

deb http://mirrors.aliyun.com/ubuntu/ raring main restricted universe multiverse  deb http://mirrors.aliyun.com/ubuntu/ raring-security main restricted universe multiverse  deb http://mirrors.aliyun.com/ubuntu/ raring-updates main restricted universe multiverse  deb http://mirrors.aliyun.com/ubuntu/ raring-proposed main restricted universe multiverse  deb http://mirrors.aliyun.com/ubuntu/ raring-backports main restricted universe multiverse  deb-src http://mirrors.aliyun.com/ubuntu/ raring main restricted universe multiverse  deb-src http://mirrors.aliyun.com/ubuntu/ raring-security main restricted universe multiverse  deb-src http://mirrors.aliyun.com/ubuntu/ raring-updates main restricted universe multiverse  deb-src http://mirrors.aliyun.com/ubuntu/ raring-proposed main restricted universe multiverse  deb-src http://mirrors.aliyun.com/ubuntu/ raring-backports main restricted universe multiverse  

但是执行sudo apt-get update仍然报错,问题在于DNS没有配置好。 
解决方法:

sudo vi /etc/resolv.conf

添加

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTENnameserver 127.0.1.1#这里用的是阿里云的DNS服务器nameserver 223.5.5.5  nameserver 223.6.6.6

之后执行sudo apt-get update就正常了。

参考: 
ubuntu apt-get update 失败解决。 
Ubuntu操作系统“Failed to fetch”错误的解决方法

The following extra packages will be installed: openssh-client openssh-server ssh-import-id Suggested packages: libpam-ssh keychain monkeysphere openssh-blacklist openssh-blacklist-extra rssh molly-guard The following NEW packages will be installed: openssh-server ssh ssh-import-id The following packages will be upgraded: openssh-client 1 upgraded, 3 newly installed, 0 to remove and 767 not upgraded. Need to get 1,310 kB of archives. After this operation, 926 kB of additional disk space will be used. Do you want to continue [Y/n]? y WARNING: The following packages cannot be authenticated! openssh-client openssh-server ssh ssh-import-id Install these packages without verification [y/N]? y Err http://us.archive.ubuntu.com/ubuntu/ precise-updates/main openssh-client i386 1:5.9p1-5ubuntu1.10 404 Not Found [IP: 91.189.91.82 80] Err http://us.archive.ubuntu.com/ubuntu/ precise/main ssh-import-id all 2.10-0ubuntu1 404 Not Found [IP: 91.189.91.82 80] Err http://security.ubuntu.com/ubuntu/ precise-security/main openssh-client i386 1:5.9p1-5ubuntu1.10 404 Not Found [IP: 91.189.91.81 80] Err http://security.ubuntu.com/ubuntu/ precise-security/main openssh-server i386 1:5.9p1-5ubuntu1.10 404 Not Found [IP: 91.189.91.81 80] Err http://security.ubuntu.com/ubuntu/ precise-security/main ssh all 1:5.9p1-5ubuntu1.10 404 Not Found [IP: 91.189.91.81 80] Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-client_5.9p1-5ubuntu1.10_i386.deb 404 Not Found [IP: 91.189.91.81 80] Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-server_5.9p1-5ubuntu1.10_i386.deb 404 Not Found [IP: 91.189.91.81 80] Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/ssh_5.9p1-5ubuntu1.10_all.deb 404 Not Found [IP: 91.189.91.81 80] Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/s/ssh-import-id/ssh-import-id_2.10-0ubuntu1_all.deb 404 Not Found [IP: 91.189.91.82 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
08-09
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