修改/etc/apt/sources.list
root@raspberrypi:/etc/apt# cat sources.list
deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib
修改 /etc/apt/ sources.list.d/raspi.list
root@raspberrypi:/etc/apt/sources.list.d# cat raspi.list
deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
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