Tumbleweed system, security trust relation not found. How to check software signatures settings.

Hallo, My tumbleweed system generates an update error: Security trust relation could not be found.
Before this error the tumbleweed system involved was up to date

Looking into the problem the system suggested:“Check your software signatures settings”

How can I do that?

Regards, Frans

Hi
YaST software repositories GPG keys (botom right button).

Another;


rpm -qa |grep pubkey

Do you have any non-standard repositories active, maybe the key has expired…


zypper lr -E