1.先备份源文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo cp /etc/apt/sources.list.d/raspi.list /etc/apt/sources.list.d/raspi.list.bak
2.编辑系统源文件
suod vim /etc/apt/sources.list
3.将初始的源使用#注释掉，添加如下两行清华的镜像源
deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main contrib non-free rpi
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main contrib non-free rpi
4.完成源的更新软件包索引
sudo apt-get update&&upgrade
5.更改系统源
deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
6.更改pip源
mkdir -p ~/.pip/pip.conf
vim ~/pip/pip.conf
[global]
index-url = http://pypi.douban.com/simple/