[SOLVED] Error in the certificate verification

[Jörg-Volker Peetz <jvpeetz@web.de>]

Solution was to

  sudo dpkg-reconfigure ca-certificates

and trust the certificate `ISRG_Root_X1.crt`. I read about it here:

https://scotthelme.co.uk/lets-encrypt-old-root-expiration/

Regards,
Jörg.

Jörg-Volker Peetz wrote on 02/10/2021 13:56:
> Hi,
>
> on Debian testing, when trying to update package lists with `apt update`, the 
> following error message show up:
>
> W: Failed to fetch https://deb.debian.org/debian/dists/testing/InRelease 
> Certificate verification failed: The certificate is NOT trusted. The certificate 
> chain uses expired certificate.  Could not handshake: Error in the certificate 
> verification. [IP: 199.232.138.132 443]
>
> The IP address varies between different calls.
> Has anybody else encountered this problem?
>
> Gpg tells that the signature of `InRelease` is made
>      using RSA key 0146DC6D4A0B2914BDED34DB648ACFD622F3D138
> and
>      using RSA key A7236886F3CCCAAD148A27F80E98404D386FA1D9
>
> Any idea anybody?
>
> Regards,
> Jörg.