armbian debian buster更换源华源：

命令：

cat > /etc/apt/sources.list
#deb http://httpredir.debian.org/debian buster main contrib non-free
#deb-src http://httpredir.debian.org/debian buster main contrib non-free

#deb http://httpredir.debian.org/debian buster-updates main contrib non-free
#deb-src http://httpredir.debian.org/debian buster-updates main contrib non-free

#deb http://httpredir.debian.org/debian buster-backports main contrib non-free
#deb-src http://httpredir.debian.org/debian buster-backports main contrib non-free

#deb http://security.debian.org/ buster/updates main contrib non-free
#deb-src http://security.debian.org/ buster/updates main contrib non-free

deb [arch=arm64] https://mirrors.tuna.tsinghua.edu.cn/debian buster main contrib non-free
deb [arch=arm64] https://mirrors.tuna.tsinghua.edu.cn/debian buster-updates main contrib non-free
deb [arch=arm64] https://mirrors.tuna.tsinghua.edu.cn/debian buster-backports main contrib non-free
deb [arch=arm64] https://mirrors.tuna.tsinghua.edu.cn/debian-security/ buster/updates main contrib non-free

然后按Ctrl-D键再回车即可

然后运行

1 2	apt clean apt update