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请参阅 [Ubuntu简介]

警告！该版本目前还处于开发阶段。只能用它做实验
升级后, 可能会破坏你整个系统的完整性

sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
sudo gedit /etc/apt/sources.list

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将下列行替代整个文件内容

deb http://us.archive.ubuntu.com/ubuntu dapper main restricted
deb-src http://us.archive.ubuntu.com/ubuntu dapper main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu dapper-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu dapper-updates main restricted

## Uncomment the following two lines to add software from the 'universe'
## repository.
## 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
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://us.archive.ubuntu.com/ubuntu dapper universe
deb-src http://us.archive.ubuntu.com/ubuntu dapper universe

## 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://us.archive.ubuntu.com/ubuntu dapper-backports main
restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu dapper-backports main
restricted universe multiverse

deb http://security.ubuntu.com/ubuntu dapper-security main restricted
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted

deb http://security.ubuntu.com/ubuntu dapper-security universe
deb-src http://security.ubuntu.com/ubuntu dapper-security universe

deb http://archive.ubuntu.com/ubuntu dapper multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper multiverse

## Backports
deb http://archive.ubuntu.com/ubuntu dapper-backports main restricted
universe multiverse

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保存编辑好的文件

sudo apt-get update
sudo apt-get dist-upgrade

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保存和关闭所有打开的应用程序，重启计算机。

升级到Dapper
http://wiki.ubuntu.org.cn/%E5%8D%87%E7%BA%A7%E5%88%B0Dapper

贴过来有几句折行有点问题

origin是dapper自己带的源
extend是扩展好了的

sources.list.dapper.origin 1K Download

sourcec.list.dapper.extend 2K Download