【NanoPi2试用体验】4.如何更新Debian软件源（非常重要）

Debian中用过apt-get install 一键安装的同学们肯定深有体会，这个实在是太方便了；
但是官方给的固件中却不能这样做，大煞风景呀，嘿嘿！
那咱们就自己动手吧：
1.sudo cp /etc/apt/sources.list /etc/apt/sources.list_bak #备份一下软件源
2.sudo vi /etc/apt/sources.list
添加所需的软件源即可，下面把我的可用的软件源贴出来，方便大家，大家可以复制过去即可用之；

deb http://ftp.cn.debian.org/debian jessie main non-free contrib
deb-src http://ftp.cn.debian.org/debian jessie main non-free contrib
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-security squeeze/updates main contrib non-free
deb http://security.debian.org/ squeeze/updates main contrib
deb-src http://security.debian.org/ squeeze/updates main contrib
deb http://ftp.sjtu.edu.cn/debian/ squeeze main non-free contrib
deb http://ftp.sjtu.edu.cn/debian/ squeeze-proposed-updates main non-free contrib
deb http://ftp.sjtu.edu.cn/debian-security/ squeeze/updates main non-free contrib
deb http://mirrors.sohu.com/debian/ lenny main non-free contrib
deb http://mirrors.sohu.com/debian/ lenny-proposed-updates main non-free contrib
deb-src http://mirrors.sohu.com/debian/ lenny main non-free contrib
deb-src http://mirrors.sohu.com/debian/ lenny-proposed-updates main non-free contribdeb
deb http://http.us.debian.org/debian wheezy main contrib non-free
deb http://non-us.debian.org/debian-non-US wheezy/non-US main contrib non-free
deb http://security.debian.org wheezy/updates main contrib non-free