树莓派切换软件源提高下载速度

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nano /etc/apt/sources.list

# deb http://mirrors.ustc.edu.cn/raspbian/raspbian/ wheezy main contrib non-free rpi
deb http://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ wheezy main
deb-src http://mirrors.ustc.edu.cn/raspbian/raspbian/ wheezy main contrib non-free rpi

apt-get update
apt-get upgrade