将CD加入Ubuntu的apt-get源

1、首先执行下面命令，它会卸载CD设备，提示插入光盘

sudo apt-cdrom --no-act add (if everything is OK, then you can use sudo apt-cdrom add ).

２、将Ubuntu光盘放入光驱，待光驱读取一段时间自动挂载后，输入：

sudo apt-cdrom add 

  执行结果如下：

Using CD-ROM mount point /media/bdd/Ubuntu-Kylin 14.04.2 LTS amd64/
Identifying... [d2eebc1e39f5b2dd0bae86aa6d16a44e-2]
Scanning disc for index files...
Found 8 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
This disc is called: 
'Ubuntu-Kylin 14.04.2 LTS _Trusty Tahr_ - Release amd64 (20150218.1)'
Copying package lists...gpgv: Signature made 2015年02月19日 星期四 03时58分32秒 CST using DSA key ID FBB75451
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key "
Reading Package Indexes... Done
Writing new source list
Source list entries for this disc are:
deb cdrom:[Ubuntu-Kylin 14.04.2 LTS _Trusty Tahr_ - Release amd64 (20150218.1)]/ trusty main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.

3、执行：sudo apt-get update后，使用sudo apt-get install 就可以安装你想要到软件了。

注意，执行完成后查看cat /etc/apt/sources.list文件，确保文件如下一行在文件顶部或者在网络源前面，否则，安装软件的时候系统还是优先从网络上下载。
deb cdrom:[Ubuntu-Kylin 14.04.2 LTS Trusty Tahr - Release amd64 (20150218.1)]/ trusty main multiverse restricted universe