剛裝完debian，發現直接apt-get是用不了的，系統會提示你插入DVD，其實是源的配置問題，只需要在apt的源裡面修改下配置就可以了。

開啟apt原始檔

sudo vi /etc/apt/sources.list
加入程式碼
deb http://http.us.debian.org/debian/ stable main
同時把deb cdrom:[Debian GNU/Linux 7.4.0 Wheezy - Official i386 DVD Binary-1 20 140208-12:26]/ wheezy contrib main註釋掉

修改後的程式碼為

# 
 
# deb cdrom:[Debian GNU/Linux 7.4.0 _Wheezy_ - Official i386 DVD Binary-1 20    140208-12:26]/ wheezy contrib main

# deb cdrom:[Debian GNU/Linux 7.4.0 _Wheezy_ - Official i386 DVD Binary-1 20    140208-12:26]/ wheezy contrib main
 
deb http://security.debian.org/ wheezy/updates main contrib
deb-src http://security.debian.org/ wheezy/updates main contrib

deb http://http.us.debian.org/debian/ stable main

# wheezy-updates, previously known as 'volatile'
# A network mirror was not selected during install.  The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
# deb http://ftp.debian.org/debian/ wheezy-updates main contrib
# deb-src http://ftp.debian.org/debian/ wheezy-updates main contrib
 

儲存退出，執行更新命令
sudo apt-get update
更新完後就可以使用apt-get來安裝軟體了