要更換Debian的軟件源，可以按照以下步驟進行：
打開終端。
編輯 /etc/apt/sources.list 文件，可以使用任何文本編輯器進行編輯，比如 nano：
sudo nano /etc/apt/sources.list
deb http://deb.debian.org/debian/ buster main
deb-src http://deb.debian.org/debian/ buster main
deb http://security.debian.org/debian-security buster/updates main
deb-src http://security.debian.org/debian-security buster/updates main
# buster-updates, previously known as 'volatile'
deb http://deb.debian.org/debian/ buster-updates main
deb-src http://deb.debian.org/debian/ buster-updates main
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
sudo apt update
這樣就成功更換了Debian的軟件源。
