新装的系统执行apt-get update一直报错，详情如下：
Release file for http://security.debian.org/dists/bullseye-security/InRelease is expired. Updates for this repository will not be applied.
尝试过校正时区和同步时间都没有效果，排查之后将源修改即可解决问题
- 修改前
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://security.debian.org/ bullseye-security main contrib non-free
#deb-src http://security.debian.org/ bullseye-security main contrib non-free
- 修改后
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