树莓派自带的软件源是
deb http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi
由于网站在国外，导致下载速度非常慢，因此需要修改为国内镜像站点即可。
Raspberry Pi(树莓派)国内软件源：
修改配置文件：sudo vim /etc/apt/sources.list
deb http://mirrors.neusoft.edu.cn/raspbian/raspbian/ wheezy main contrib non-free rpi
deb-src http://mirrors.neusoft.edu.cn/raspbian/raspbian/ wheezy main contrib non-free rpi
deb http://mirrors.ustc.edu.cn/raspbian/raspbian/ wheezy main contrib non-free rpi
deb-src http://mirrors.ustc.edu.cn/raspbian/raspbian/ wheezy main contrib non-free rpi