先声明，由于linux的特殊性，不保证此方法在长远的未来还有效。但是今晚我第一次安装ubuntu，这个方法绝对是目前最快的。
      本文章只介绍如何快速升级ubuntu中文包，不介绍ubuntu的安装。
       我是第一次安装ubuntu！安装完成后，我发现虽然是安装的简体中文版，但里面并不是全部中文，需要升级中文包，系统才可以完全变成纯中文（其实还有极少量的英文）！但是升级这个中文包时发现升级的速度慢的惊人，只有几B／S。要是按这样的速度，升级完成至少需要半天（绝对没有夸张）。
        现在介绍我的方法：
第一：更新源。可以用sudo gedit /etc/apt/sources.list 命令
然后把打开文件里面的内容全部更换为
# deb cdrom:[Ubuntu 8.10 _Intrepid Ibex_ - Release amd64 (20081029.2)]/ intrepid main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://mirror.lupaworld.com/ubuntu/archive/ intrepid main restricted
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirror.lupaworld.com/ubuntu/archive/ intrepid-updates main restricted
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid-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://mirror.lupaworld.com/ubuntu/archive/ intrepid universe
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid universe
deb http://mirror.lupaworld.com/ubuntu/archive/ intrepid-updates universe
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid-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://mirror.lupaworld.com/ubuntu/archive/ intrepid multiverse
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ intrepid-updates multiverse
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid-updates multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## 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://cn.archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe 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 intrepid partner
# deb-src http://archive.canonical.com/ubuntu intrepid partner

deb http://mirror.lupaworld.com/ubuntu/archive/ intrepid-security main restricted
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid-security main restricted
deb http://mirror.lupaworld.com/ubuntu/archive/ intrepid-security universe
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid-security universe
deb http://mirror.lupaworld.com/ubuntu/archive/ intrepid-security multiverse
deb-src http://mirror.lupaworld.com/ubuntu/archive/ intrepid-security multiverse

## gns3 ccna-ccie
# gpl.code.de
deb http://gpl.code.de/ubuntu gutsy/
deb-src http://gpl.code.de/ubuntu gutsy/

然后保存，再sudo apt-get update
第二步：等sudo apt-get update命令运行完成，关闭终端。（这一步貌似不用说的......）
第三步：点击system------------系统管理-----------Language support---------方框里面找到 汉语 在其后面的小方框打勾----------OK！
以上三个步骤中第一步更新源是最关键的，只要源好下载速度就好，我用的是学校光纤，下载速度最快达到3M／S，平均600KB／S，只用了不到三分钟就下载完了...
小提示：此方法如果你试后感觉速度不快的话（其实相对于系统本身提供的源的下载速度，10KB／S就是绝对告诉了），你只需在百度搜一下 ubuntu （版本号）最快的源 （最好去Google 用高级搜索，搜过去一周内的）就可以了。