ubuntu apt-get 下载软件ERROR的问题

背景：
1. 错误信息： E: Unable to locate package
2. linux 使用 apt-get 管理 各种软件 ，其使用 /etc/apt/sources.list 作为软件源，当某些源 不可用的时候 就会出现 apt-get install ERROR的 问题。
3. 所以 源 不可用的时候， 就要更新 sources.list 文件。

操作步骤：

一、备份原sources.list文件 (good habit)

–

sudo cp /etc/apt/sources.list   /etc/apt/sources.list.bakup

二、网上找一些可用的 源， 替换该文件，见 附录一

三、更新启用新的源

sudo apt-get update

附录一：

测试可用的：

deb http://cn.archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty main restricted

deb http://cn.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty-updates main restricted

deb http://cn.archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty universe
deb http://cn.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty-updates universe

deb http://cn.archive.ubuntu.com/ubuntu/ trusty multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty-updates multiverse

deb http://cn.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://cn.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

deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main

网上的未测试的源：

网易 Ubuntu 11.10 源（速度很快）

deb http://mirrors.163.com/ubuntu/ oneiric main universe restricted multiverse
deb-src http://mirrors.163.com/ubuntu/ oneiric main universe restricted multiverse
deb http://mirrors.163.com/ubuntu/ oneiric-security universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ oneiric-security universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ oneiric-updates universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ oneiric-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ oneiric-proposed universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ oneiric-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ oneiric-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ oneiric-updates universe main multiverse restricted

骨头源，骨头源是bones7456架设的一个Ubuntu源 ，提供ubuntu,deepin

deb http://ubuntu.srt.cn/ubuntu/ oneiric main universe restricted multiverse
deb-src http://ubuntu.srt.cn/ubuntu/ oneiric main universe restricted multiverse
deb http://ubuntu.srt.cn/ubuntu/ oneiric-security universe main multiverse restricted
deb-src http://ubuntu.srt.cn/ubuntu/ oneiric-security universe main multiverse restricted
deb http://ubuntu.srt.cn/ubuntu/ oneiric-updates universe main multiverse restricted
deb http://ubuntu.srt.cn/ubuntu/ oneiric-proposed universe main multiverse restricted
deb-src http://ubuntu.srt.cn/ubuntu/ oneiric-proposed universe main multiverse restricted
deb http://ubuntu.srt.cn/ubuntu/ oneiric-backports universe main multiverse restricted
deb-src http://ubuntu.srt.cn/ubuntu/ oneiric-backports universe main multiverse restricted
deb-src http://ubuntu.srt.cn/ubuntu/ oneiric-updates universe main multiverse restricted

mirror.lupaworld.com的源，速度很快

deb http://mirror.lupaworld.com/ubuntu/archive/ oneiric main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ oneiric-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ oneiric-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ oneiric-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn/ oneiric main restricted universe multiverse

这里你也可以直接使用更快速的ubuntu.cn99.com的源（推荐）:

deb http://ubuntu.cn99.com/ubuntu/ oneiric main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ oneiric-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ oneiric-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ oneiric main restricted universe multiverse

//教育网源
如果大家是在校大学生，可以使用校园网/教育网，就是用教育网的资源吧，中科大，兰大、厦门大学都有很多资源，尤其是支持ipv6的，那更新速度就按兆算了。
中科大：http://mirrors.ustc.edu.cn/
厦门大学：http://mirrors.xmu.edu.cn/howto/
大家可以自己根据自己的版本设置一下，不一定局限于ubuntu 11.10，下面列出一些校内更新源。

电子科技大学

deb http://ubuntu.uestc.edu.cn/ubuntu/ oneiric main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-backports main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-proposed main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-updates main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ oneiric main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-backports main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-proposed main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-updates main restricted universe multiverse

中国科技大学

deb http://mirrors.ustc.edu.cn/ubuntu/ oneiric main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ oneiric-backports restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ oneiric-proposed main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ oneiric-updates main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ oneiric main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ oneiric-backports main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ oneiric-proposed main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ oneiric-updates main restricted universe multiverse

北京理工大学

deb http://mirror.bjtu.edu.cn/ubuntu/ oneiric main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ oneiric-backports main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ oneiric-proposed main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ oneiric-security main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ oneiric-updates main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ oneiric main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ oneiric-backports main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ oneiric-proposed main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ oneiric-security main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ oneiric-updates main multiverse restricted universe

兰州大学

deb ftp://mirror.lzu.edu.cn/ubuntu/ oneiric main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ oneiric-backports main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ oneiric-proposed main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ oneiric-security main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ oneiric-updates main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ oneiric main multiverse restricted universe

上海交通大学

deb http://ftp.sjtu.edu.cn/ubuntu/ oneiric main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ oneiric-backports main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ oneiric-proposed main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ oneiric-security main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ oneiric-updates main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu-cn/ oneiric main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ oneiric main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ oneiric-backports main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ oneiric-proposed main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ oneiric-security main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ oneiric-updates main multiverse restricted universe