起因是在 盒子上安装 debian，安装好以后，执行apt-get update 始终报错：
Err:9 mirrors.cloud.tencent.com/debian-secu… buster/updates Release Certificate verification failed: The certificate is NOT trusted. The certificate chain uses not yet valid certificate. Could not handshake: Error in the certificate verification. [IP: 111.231.36.190 443] Reading package lists... Done
E: The repository 'mirrors.cloud.tencent.com/debian-secu… buster/updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Release file for mirrors.cloud.tencent.com/debian/dist… is not valid yet (invalid for another 358d 15h 15min 43s). Updates for this repository will not be applied.
E: Release file for mirrors.cloud.tencent.com/debian/dist… is not valid yet (invalid for another 392d 0h 45min 16s). Updates for this repository will not be applied.
E: Release file for mirrors.cloud.tencent.com/debian/dist… is not valid yet (invalid for another 392d 0h 45min 15s). Updates for this repository will not be applied.
期间就算切换源 也没用， 切了各大学，各大企业 的源，都报 证书校验错误。
尝试强制在 /etc/apt/sources.list 添加 trusted=yes 也不行。
deb [trusted=yes] mirrors.ustc.edu.cn/debian/ buster main contrib non-free
各种更新证书的方式也试了，没有一个有效。
最后发现是 机器时间设置 问题，因为证书校验是 时间敏感的。 而我的机器时间还停留在去年。
搜到了 stackoverflow.com/questions/2… 这里，才看到了 答案：
Another cause of this problem might be that your clock might be off. Certificates are time sensitive. To check the current system time:
date -R
You might consider installing NTP to automatically sync the system time with trusted internet timeservers from the global NTP pool. For example, to install on Debian/Ubuntu: apt-get install ntp
apt-get install ntp
耽误了得有一天时间， 罪过！
