Debian计划是由以创造一份自由操作系统为共同目标的个人团体所组建的协会.这份操作系统就叫作Debian GNU/Linux,或者简称为Debian.Ubuntu就是一个典型的基于Debian的发行套件..Debian提供了20000多套软件,它们是已经编译好了的软件,并按一种出色的格式打成包,可以供你在机器上方便地安装.这一切都可以免费获得.
September 5th, 2009
The Debian project is pleased to announce the third update of its stable distribution Debian GNU/Linux 5.0 (codename lenny). This update mainly adds corrections for security problems to the stable release, along with a few adjustment to serious problems.
Please note that this update does not constitute a new version of Debian GNU/Linux 5.0 but only updates some of the packages included. There is no need to throw away 5.0 CDs or DVDs but only to update via an up-to-date Debian mirror after an installation, to cause any out of date packages to be updated.
Those who frequently install updates from security.debian.org won't have to update many packages and most updates from security.debian.org are included in this update.

下载：Debian GNU Linux 5.0.3