linux 光盘作为软件源

首先将linux系统安装盘（是利用ultroiso制作的系统盘)作为软件源，在无网络环境下安装软件

1. 将光盘放入光驱，稍等，执行sudo apt-cdrom ident 命令（进行MD5校验，识别光盘）

atom@atom-desktop:~$ sudo apt-cdrom ident
Using CD-ROM mount point /cdrom/
Mounting CD-ROM
Identifying.. [ac20a1ac35626cb607897968f3dd2440-2]
Stored label: Ubuntu 8.10 _Intrepid Ibex_ - Release i386 (20081029.5)
Unmounting CD-ROM...

2. 执行 sudo apt-cdrom add 将光盘源写入到/etc/apt/sources.list

atom@atom-desktop:~$ sudo apt-cdrom add

Using CD-ROM mount point /cdrom/
Unmounting CD-ROM
Waiting for disc...
Please insert a Disc in the drive and press enter 
（未插入光盘则插入；以插入则直接按回车）

Mounting CD-ROM...
Identifying.. [ac20a1ac35626cb607897968f3dd2440-2]
Scanning disc for index files..
Found 2 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
This disc is called: 
'Ubuntu 8.10 _Intrepid Ibex_ - Release i386 (20081029.5)'
Copying package lists...gpgv: Signature made Thu 30 Oct 2008 07:24:11 AM CST using DSA key ID FBB75451
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key <[e-mail]>"
Reading Package Indexes... Done
Writing new source list
Source list entries for this disc are:
deb cdrom:[Ubuntu 8.10 _Intrepid Ibex_ - Release i386 (20081029.5)]/ intrepid main restricted
Unmounting CD-ROM...
Repeat this process for the rest of the CDs in your set.
W: Skipping non-exisiting file /cdrom/dists/intrepid/main/binary-i386/Packages
W: Skipping non-exisiting file /cdrom/dists/intrepid/restricted/binary-i386/Packages

至此，光盘源建立好了，你可以看到sources.list开头多了一些这么东西
atom@atom-desktop:~$ /etc/apt/sources.list
deb cdrom:[Ubuntu 8.10 _Intrepid Ibex_ - Release i386 (20081029.5)]/ intrepid main restricted
3. 这样就可以执行安装相应的程序了，例如build-essential

sudo apt-get install build-essential