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sudo apt install xrdp

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sudo nano /etc/apt/sources.list

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deb http://mirrors.ustc.edu.cn/raspbian/raspbian/ buster main contrib non-free rpi

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

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deb http://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ buster main ui

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sudo apt update
sudo apt upgrade
sudo apt dist-upgrade