Debian 預設apt-get源為從cd介質安裝

⒈備份官方預設更新原始檔

cp /etc/apt/sources.list /etc/apt/sources.list.bak        備份官方更新原始檔

⒉編輯

　　1.開啟　　

vi /etc/apt/sources.list

　　2.清空內容

　　ESC後進入命令模式輸入

:.,$d

　　3.複製為以下內容（清華大學映象站）https://mirrors.tuna.tsinghua.edu.cn/help/debian/

# 預設註釋了原始碼映象以提高 apt update 速度，如有需要可自行取消註釋
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
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free

　　4.儲存

　　ESC後進入命令模式輸入　　　

:wq

⒊更新源

apt update