一、备份现有apt源配置
mv /etc/apt/sources.list /etc/apt/sources.list.old
二、替换源
1. 默认官方源
cat > /etc/apt/sources.list << EOF deb http://deb.debian.org/debian/ bullseye main contrib non-free deb-src http://deb.debian.org/debian/ bullseye main contrib non-free deb http://deb.debian.org/debian/ bullseye-updates main contrib non-free deb-src http://deb.debian.org/debian/ bullseye-updates main contrib non-free deb http://deb.debian.org/debian/ bullseye-backports main contrib non-free deb-src http://deb.debian.org/debian/ bullseye-backports main contrib non-free deb http://deb.debian.org/debian-security/ bullseye-security main contrib non-free deb-src http://deb.debian.org/debian-security/ bullseye-security main contrib non-free EOF
2. 腾讯云
cat > /etc/apt/sources.list << EOF deb http://mirrors.tencentyun.com/debian/ bullseye main contrib non-free deb-src http://mirrors.tencentyun.com/debian/ bullseye main contrib non-free deb http://mirrors.tencentyun.com/debian/ bullseye-updates main contrib non-free deb-src http://mirrors.tencentyun.com/debian/ bullseye-updates main contrib non-free deb http://mirrors.tencentyun.com/debian/ bullseye-backports main contrib non-free deb-src http://mirrors.tencentyun.com/debian/ bullseye-backports main contrib non-free deb http://mirrors.tencentyun.com/debian-security/ bullseye-security main contrib non-free deb-src http://mirrors.tencentyun.com/debian-security/ bullseye-security main contrib non-free EOF
3. 阿里云
cat > /etc/apt/sources.list << EOF deb http://mirrors.cloud.aliyuncs.com/debian/ bullseye main contrib non-free deb-src http://mirrors.cloud.aliyuncs.com/debian/ bullseye main contrib non-free deb http://mirrors.cloud.aliyuncs.com/debian/ bullseye-updates main contrib non-free deb-src http://mirrors.cloud.aliyuncs.com/debian/ bullseye-updates main contrib non-free deb http://mirrors.cloud.aliyuncs.com/debian/ bullseye-backports main contrib non-free deb-src http://mirrors.cloud.aliyuncs.com/debian/ bullseye-backports main contrib non-free deb http://mirrors.cloud.aliyuncs.com/debian-security/ bullseye-security main contrib non-free deb-src http://mirrors.cloud.aliyuncs.com/debian-security/ bullseye-security main contrib non-free EOF
4. 中科大
cat > /etc/apt/sources.list << EOF deb https://mirrors.ustc.edu.cn/debian/ buster main contrib non-free deb https://mirrors.ustc.edu.cn/debian/ buster-updates main contrib non-free deb https://mirrors.ustc.edu.cn/debian/ buster-backports main contrib non-free deb https://mirrors.ustc.edu.cn/debian-security/ buster/updates main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ buster main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ buster-updates main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ buster-backports main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian-security/ buster/updates main contrib non-free EOF
5. Linode源
cat > /etc/apt/sources.list << EOF deb http://mirrors.linode.com/debian/ bullseye main contrib non-free deb-src http://mirrors.linode.com/debian/ bullseye main contrib non-free deb http://mirrors.linode.com/debian/ bullseye-updates main contrib non-free deb-src http://mirrors.linode.com/debian/ bullseye-updates main contrib non-free deb http://mirrors.linode.com/debian/ bullseye-backports main contrib non-free deb-src http://mirrors.linode.com/debian/ bullseye-backports main contrib non-free deb http://mirrors.linode.com/debian-security/ bullseye-security main contrib non-free deb-src http://mirrors.linode.com/debian-security/ bullseye-security main contrib non-free EOF