Dietpi-update failed while not trusted certificates; please help

Troubleshooting
21

It looks to me like your system time was not synchronised or was not up to date. I am in Germany and even if I set my system time to UTC, apt continues to run without problems and certificate issues.

root@DietPi4:~# date
Tue Oct 10 09:55:07 UTC 2023
root@DietPi4:~#

root@DietPi4:~# apt update
Hit:1 https://deb.debian.org/debian bullseye InRelease
Hit:2 https://archive.raspberrypi.org/debian bullseye InRelease
Hit:3 https://deb.debian.org/debian bullseye-updates InRelease
Hit:4 https://deb.debian.org/debian-security bullseye-security InRelease
Hit:5 https://deb.debian.org/debian bullseye-backports InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
23 packages can be upgraded. Run 'apt list --upgradable' to see them.
root@DietPi4:~#
22

I apologise, you are right, the time was not synced properly. /boot/dietpi/func/run_ntpd 1 helped to sync it and systemctl enable systemd-timesyncd.service to ensure it stays synced. I wonder why it does not sync in the first place, but I failed to check if the service was running before.

It’s also weird why it would not report those issues when I was on CEST, but at least the problem is solved in the right way, now. Thank you.