sudo nano /etc/apt/sources.list
修改內容為：
deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib rpi
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib rpi
sudo nano /etc/apt/sources.list.d/raspi.list
修改內容為：
deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
sudo apt-get update
執行反饋顯示：
Hit:1 http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian buster InRelease
Hit:2 http://mirrors.tuna.tsinghua.edu.cn/raspberrypi buster InRelease
Ign:3 https://packagecloud.io/headmelted/codebuilds/raspbian buster InRelease
Err:4 https://packagecloud.io/headmelted/codebuilds/raspbian buster Release
404 Not Found [IP: 54.183.38.243 443]
Hit:5 https://download.mono-project.com/repo/debian stable-raspbianbuster InRelease
Reading package lists... Done
E: The repository 'https://packagecloud.io/headmelted/codebuilds/raspbian buster Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
我明明是按教程來做的，就是不通，求教
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