說明：在沒有接入網絡的情況下，采用最小化方式安裝debian，默認是沒有配置apt-get源的，這個時候是無法使用apt-get install 在線安裝軟件的，也無法使用putty等遠程管理客戶端連接服務器，下面教大家配置apt-get源：
cp /etc/apt/sources.list /etc/apt/sources.listbak #備份原有配置文件
nano /etc/apt/sources.list #編輯
注釋掉本地光盤源這一行：
deb cdrom:[Debian GNU/Linux 6.0.4 _Squeeze_ - Official i386 DVD Binary-1 20120128-12:53]/ squeeze contrib main
取消下面兩行官方源前面的注釋，添加以下代碼：
deb http://mirrors.163.com/debian/ squeeze main non-free contrib deb http://mirrors.163.com/debian/ squeeze-proposed-updates main contrib non-free deb http://mirrors.163.com/debian-security/ squeeze/updates main contrib non-free deb-src http://mirrors.163.com/debian/ squeeze main non-free contrib deb-src http://mirrors.163.com/debian/ squeeze-proposed-updates main contrib non-free deb-src http://mirrors.163.com/debian-security/ squeeze/updates main contrib non-free deb http://ftp.sjtu.edu.cn/debian/ squeeze main non-free contrib deb http://ftp.sjtu.edu.cn/debian/ squeeze-proposed-updates main contrib non-free deb http://ftp.sjtu.edu.cn/debian-security/ squeeze/updates main contrib non-free deb-src http://ftp.sjtu.edu.cn/debian/ squeeze main non-free contrib deb-src http://ftp.sjtu.edu.cn/debian/ squeeze-proposed-updates main contrib non-free deb-src http://ftp.sjtu.edu.cn/debian-security/ squeeze/updates main contrib non-free
ctrl+o #保存配置
ctrl+x #退出
apt-get update #更新源
apt-get upgrade #更新系統
原文鏈接：http://www.dedecms.com/knowledge/servers/linux-bsd/2012/0819/8450.html