有些时候我们选择的Linux云服务器默认是Debian官方国外的源，使用国外的源在国内用的时候安装软件速度比较慢。于是，我们一般是会切换成国内的镜像源的。在这里，国内的源也有很多可以选择，比如中科大、华为云、腾讯云、163等。
我们可以在Debian官方全球源列表中看到中国的源渠道，这里我整理8个常用的源。
当然，如果我们需要更换源的时候直接在对应的：
/etc/apt/sources.list
文件中复制更新后再执行升级。
apt update -y&& apt upgrade -y
阿里云源镜像
deb http://mirrors.aliyun.com/debian/ buster main non-free contrib deb http://mirrors.aliyun.com/debian-security buster/updates main deb http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib deb http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib deb-src http://mirrors.aliyun.com/debian-security buster/updates main deb-src http://mirrors.aliyun.com/debian/ buster main non-free contrib deb-src http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib deb-src http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
163源镜像
deb http://mirrors.163.com/debian/ buster main non-free contrib deb http://mirrors.163.com/debian/ buster-updates main non-free contrib deb http://mirrors.163.com/debian/ buster-backports main non-free contrib deb http://mirrors.163.com/debian-security/ buster/updates main non-free contrib deb-src http://mirrors.163.com/debian/ buster main non-free contrib deb-src http://mirrors.163.com/debian/ buster-updates main non-free contrib deb-src http://mirrors.163.com/debian/ buster-backports main non-free contrib deb-src http://mirrors.163.com/debian-security/ buster/updates main non-free contrib
腾讯云源镜像
deb http://mirrors.cloud.tencent.com/debian/ buster main non-free contrib deb http://mirrors.cloud.tencent.com/debian-security buster/updates main deb http://mirrors.cloud.tencent.com/debian/ buster-updates main non-free contrib deb http://mirrors.cloud.tencent.com/debian/ buster-backports main non-free contrib deb-src http://mirrors.cloud.tencent.com/debian-security buster/updates main deb-src http://mirrors.cloud.tencent.com/debian/ buster main non-free contrib deb-src http://mirrors.cloud.tencent.com/debian/ buster-updates main non-free contrib deb-src http://mirrors.cloud.tencent.com/debian/ buster-backports main non-free contrib
华为云源镜像
deb https://mirrors.huaweicloud.com/debian/ buster main contrib non-free deb https://mirrors.huaweicloud.com/debian/ buster-updates main contrib non-free deb https://mirrors.huaweicloud.com/debian/ buster-backports main contrib non-free deb https://mirrors.huaweicloud.com/debian-security/ buster/updates main contrib non-free deb-src https://mirrors.huaweicloud.com/debian/ buster main contrib non-free deb-src https://mirrors.huaweicloud.com/debian/ buster-updates main contrib non-free deb-src https://mirrors.huaweicloud.com/debian/ buster-backports main contrib non-free
中科大源镜像
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
清华大学源镜像
deb 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 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/ buster main contrib non-free deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security/ buster/updates main contrib non-free
兰州大学源镜像
deb http://mirror.lzu.edu.cn/debian stable main contrib non-free deb http://mirror.lzu.edu.cn/debian stable-updates main contrib non-free deb http://mirror.lzu.edu.cn/debian/ buster-backports main contrib non-free deb http://mirror.lzu.edu.cn/debian-security/ buster/updates main contrib non-free deb-src http://mirror.lzu.edu.cn/debian stable main contrib non-free deb-src http://mirror.lzu.edu.cn/debian stable-updates main contrib non-free deb-src http://mirror.lzu.edu.cn/debian/ buster-backports main contrib non-free deb-src http://mirror.lzu.edu.cn/debian-security/ buster/updates main contrib non-free
上海交大源镜像
deb https://mirror.sjtu.edu.cn/debian/ buster main contrib non-free deb https://mirror.sjtu.edu.cn/debian/ buster-updates main contrib non-free deb https://mirror.sjtu.edu.cn/debian/ buster-backports main contrib non-free deb https://mirror.sjtu.edu.cn/debian-security/ buster/updates main contrib non-free deb-src https://mirror.sjtu.edu.cn/debian/ buster-updates main contrib non-free deb-src https://mirror.sjtu.edu.cn/debian/ buster-backports main contrib non-free deb-src https://mirror.sjtu.edu.cn/debian/ buster main contrib non-free deb-src https://mirror.sjtu.edu.cn/debian-security/ buster/updates main contrib non-free
这里的几个国内源镜像，可以根据需要选择使用。如果我们的服务器已经是国内的源就没有必要更换。