http://mirrors.163.com/.help/debian.html 163 官方源地址，每4小时更新一次
如果是 Debian10 更换apt源，查看debian10具体代号，是buster，如下所示：
root@4479ca5eb213:/etc/apt# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
所以需要将163 官方源地址的代号统一改为buster即可，如下所示（以下只是2020/6/16的示例，具体需要根据163 官方源地址最新发布内容进行更改）
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-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 http://mirrors.163.com/debian-security/ buster/updates main non-free contrib
deb-src http://mirrors.163.com/debian-security/ buster/updates main non-free contrib
将内容覆盖到 /etc/apt/sources.list，最后通过 apt-get update 进行更新
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