1.将N个debian-506-amd64-DVD-N.iso存放于本地或其他媒介内，本例是放在本机/iso/目录下
2.创建N个挂载点目录
如下：
debian:~#mkdir –r /media/dvd1
debian:~#mkdir –r /media/dvd2
debian:~#mkdir –r /media/dvd3
….
debian:~#mkdir –r /media/dvdN
3.挂载iso文件
debian:~#cd /iso
debian:/iso#mount –o loop debian-506-amd64-DVD-1.iso /media/dvd1/
debian:/iso#mount –o loop debian-506-amd64-DVD-2.iso /media/dvd2/
debian:/iso#mount –o loop debian-506-amd64-DVD-3.iso /media/dvd3/
…
debian:/iso#mount –o loop debian-506-amd64-DVD-N.iso /media/dvdN/
4.将旧apt源列表文件做备份，然后更改其内容
debian:/iso#cd /etc/apt/
debian:/etc/apt/#cp sources.list sources.list.bak
debian:/etc/apt/#vim sources.list
(在编辑器中仅列入如下内容)
deb file:///media/dvd1/ lenny main contrib non-free
deb-src file:///media/dvd1/ lenny main contrib non-free
deb file:///media/dvd1/ stable main contrib non-free
deb-src file:///media/dvd1/ stable main contrib non-free
deb file:///media/dvd2/ lenny main contrib non-free
deb-src file:///media/dvd2/ lenny main contrib non-free
deb file:///media/dvd2/ stable main contrib non-free
deb-src file:///media/dvd2/ stable main contrib non-free
deb file:///media/dvd3/ lenny main contrib non-free
deb-src file:///media/dvd3/ lenny main contrib non-free
deb file:///media/dvd3/ stable main contrib non-free
deb-src file:///media/dvd3/ stable main contrib non-free
deb file:///media/dvd4/ lenny main contrib non-free
deb-src file:///media/dvd4/ lenny main contrib non-free
deb file:///media/dvd4/ stable main contrib non-free
deb-src file:///media/dvd4/ stable main contrib non-free
。。。
deb file:///media/dvdN/ lenny main contrib non-free
deb-src file:///media/dvdN/ lenny main contrib non-free
deb file:///media/dvdN/ stable main contrib non-free
deb-src file:///media/dvdN/ stable main contrib non-free
5.更新目录
debian:/etc/apt/#apt-get update
有些报错（fail或error）可能是因为/media/dvdN/dists/下没有相关目录条目，没关系。最后恭喜您可以本地安装大部分（本例为debian 506 ，代号为lenny）的稳定版本软件包啦。
延伸：存放如此大容量的iso文件在本地服务器内，浪费存储资源，后续会实现在远程、局域网、移动媒介等设立自己的apt源。移动媒介仅第1、2步略有不同，其他步骤均相同。