1 备份现在的apt源配置
mv /etc/apt/sources.list /etc/apt/sources.list.old
2 替换为其他apt源
下面的内容是一条bash命令，复制后直接粘贴运行即可。
2.1 默认官方源
cat > /etc/apt/sources.list << EOF deb https://deb.debian.org/debian/ bullseye main contrib non-free deb-src https://deb.debian.org/debian/ bullseye main contrib non-free deb https://deb.debian.org/debian/ bullseye-updates main contrib non-free deb-src https://deb.debian.org/debian/ bullseye-updates main contrib non-free deb https://deb.debian.org/debian/ bullseye-backports main contrib non-free deb-src https://deb.debian.org/debian/ bullseye-backports main contrib non-free deb https://deb.debian.org/debian-security/ bullseye-security main contrib non-free deb-src https://deb.debian.org/debian-security/ bullseye-security main contrib non-free EOF
2.2 腾讯云源
cat > /etc/apt/sources.list << EOF deb https://mirrors.cloud.tencent.com/debian/ bullseye main contrib non-free deb-src https://mirrors.cloud.tencent.com/debian/ bullseye main contrib non-free deb https://mirrors.cloud.tencent.com/debian/ bullseye-updates main contrib non-free deb-src https://mirrors.cloud.tencent.com/debian/ bullseye-updates main contrib non-free deb https://mirrors.cloud.tencent.com/debian/ bullseye-backports main contrib non-free deb-src https://mirrors.cloud.tencent.com/debian/ bullseye-backports main contrib non-free deb https://mirrors.cloud.tencent.com/debian-security/ bullseye-security main contrib non-free deb-src https://mirrors.cloud.tencent.com/debian-security/ bullseye-security main contrib non-free EOF
2.3 中科大源
cat > /etc/apt/sources.list << EOF deb https://mirrors.ustc.edu.cn/debian/ bullseye main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ bullseye main contrib non-free deb https://mirrors.ustc.edu.cn/debian/ bullseye-updates main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ bullseye-updates main contrib non-free deb https://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free deb https://mirrors.ustc.edu.cn/debian-security/ bullseye-security main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian-security/ bullseye-security main contrib non-free EOF
2.4 清华源
cat > /etc/apt/sources.list << EOF deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free deb https://mirrors.tuna.tsinghua.edu.cn/debian-security/ bullseye-security main contrib non-free deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security/ bullseye-security main contrib non-free EOF
2.5 阿里云源
cat > /etc/apt/sources.list << EOF deb https://mirrors.aliyun.com/debian/ bullseye main contrib non-free deb-src https://mirrors.aliyun.com/debian/ bullseye main contrib non-free deb https://mirrors.aliyun.com/debian/ bullseye-updates main contrib non-free deb-src https://mirrors.aliyun.com/debian/ bullseye-updates main contrib non-free deb https://mirrors.aliyun.com/debian/ bullseye-backports main contrib non-free deb-src https://mirrors.aliyun.com/debian/ bullseye-backports main contrib non-free deb https://mirrors.aliyun.com/debian-security/ bullseye-security main contrib non-free deb-src https://mirrors.aliyun.com/debian-security/ bullseye-security main contrib non-free EOF
2.6 Linode源（不支持HTTPS）
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
3 更新apt索引
执行 apt update 更新apt索引。
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