ubuntu13.04更新源

第一步：备份一下Ubuntu 13.04 原来的源地址列表文件

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

第二步：修改更新源文件

sudo gedit /etc/apt/sources.list

添加Ubuntu 13.04网易的源，将原来文件内容覆盖

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://mirrors.163.com/ubuntu/ trusty main restricted
deb-src http://mirrors.163.com/ubuntu/ trusty main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirrors.163.com/ubuntu/ trusty-updates main restricted
deb-src http://mirrors.163.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://mirrors.163.com/ubuntu/ trusty universe
deb-src http://mirrors.163.com/ubuntu/ trusty universe
deb http://mirrors.163.com/ubuntu/ trusty-updates universe
deb-src http://mirrors.163.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://mirrors.163.com/ubuntu/ trusty multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty multiverse
deb http://mirrors.163.com/ubuntu/ trusty-updates multiverse
deb-src http://mirrors.163.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://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse

deb http://mirrors.163.com/ubuntu/ trusty-security main restricted
deb-src http://mirrors.163.com/ubuntu/ trusty-security main restricted
deb http://mirrors.163.com/ubuntu/ trusty-security universe
deb-src http://mirrors.163.com/ubuntu/ trusty-security universe
deb http://mirrors.163.com/ubuntu/ trusty-security multiverse
deb-src http://mirrors.163.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-src http://extras.ubuntu.com/ubuntu trusty main

第三步：更新源

sudo apt-get update

参考文章：

http://www.linuxidc.com/Linux/2013-05/83902.htm

http://www.cnblogs.com/luckygxf/p/3889596.html