Problem with updating system


  • Used Zammad version: 4.1
  • Used Zammad installation type: package
  • Operating system: Ubuntu 20.04

After sudo apt-get update i have problem with Zammad repository as follows:

Err:9 20.04 Release
Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown. Could not handshake: Error in the certificate verification. [IP: 443]
Reading package lists… Done
E: The repository ‘ 20.04 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.

Update your root certificates - DST Root CA X3 has expired.
This is a local issue on your end.

Found the problem - my FortiGate UTM was not prepared correctly for the DST Root CA X3 expiration. Got a workaround and was able to upgrade. Thank you for support.
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