Certificate verification failed

Hi!
I'm on ZorinOS 16 Pro, after "apt-update" i get these errors on certificate validations:

Err:18 https://packages.zorinos.com/stable focal Release
  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 138.68.36.163 443]
Err:19 https://packages.zorinos.com/patches focal Release
  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 138.68.36.163 443]
Err:20 https://packages.zorinos.com/apps focal Release
  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 138.68.36.163 443]
Err:21 https://packages.zorinos.com/drivers focal Release
  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 138.68.36.163 443]
Err:22 https://packages.zorinos.com/premium focal Release
  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 138.68.36.163 443]
Reading package lists... Done
E: The repository 'https://packages.zorinos.com/stable focal Release' no longer has 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: The repository 'https://packages.zorinos.com/patches focal Release' no longer has 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: The repository 'https://packages.zorinos.com/apps focal Release' no longer has 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: The repository 'https://packages.zorinos.com/drivers focal Release' no longer has 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: The repository 'https://packages.zorinos.com/premium focal Release' no longer has 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.

Thank you

Try installing/running in terminal

sudo apt install ca-certificates

This could fix the issue.

Thank you.
I don't know how but before running your command, I launched again the "apt update" and now all works fine. :sweat_smile:

Thanks you anyway.

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