Can you remove https://syncthing.net/release-key.txt
A internet-karma website uses outdated copy pasted guide using this key.
I have installed the old key not knowing it’s old. Removed the key via apt-key plus removed the key with rm, installed the new key, apt-key list doesn’t show any key and apt still complains key is untrusted and therefore repo is disabled.
That way no one else installs the old key and maybe even the guy updates his website.
Err:6 https://apt.syncthing.net syncthing Release Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 126.96.36.199 443] Reading package lists... Done E: The repository 'https://apt.syncthing.net syncthing Release' does not have 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.