更换软件源

切换到root用户

su - root

修改 /etc/apt/sources.list

sudo nano /etc/apt/sources.list

原文`deb http://mirrordirector.raspbian.org/raspbian/ stretch main contrib non-free rpi` 加#注释掉

加入如下阿里源，`deb http://mirrors.aliyun.com/raspbian/raspbian/ stretch main contrib non-free rpi`

修改/etc/apt/sources.list.d/raspi.list

sudo nano /etc/apt/sources.list.d/raspi.list

原文`deb http://archive.raspberrypi.org/debian/ stretch main ui，` 加#

加入如下科大源：`deb http://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ stretch main ui`

更新系统和软件

sudo apt-get update

`sudo apt-get upgrade`

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