http://mirrors.163.com/.help/debian.html 163 官方源地址，每4小時更新一次
如果是 Debian10 更換apt源，查看debian10具體代號，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/"
所以需要將163 官方源地址的代號統一改爲buster即可，如下所示（以下只是2020/6/16的示例，具體需要根據163 官方源地址最新發布內容進行更改）
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
將內容覆蓋到 /etc/apt/sources.list，最後通過 apt-get update 進行更新