Certificate verification failed: The certificate is NOT trusted. The
certificate chain uses expired certificate. Could not handshake: Error
in the certificate verification. [IP: 95.216.163.36 443]
Maybe renew the key ?
The repo uses a LetsEncrypt certificate.
Odds are, the OP’s system’s trust store is quite old and so still has the old root in place - LE’s intermediate has multiple signatures and one of the roots expired last year.
Running
sudo apt-get -y install ca-certificates
Should bring it up to date (assuming there’s a relatively modern openssl in use - I think 1.0 will throw an error either way because it still tries to follow both forks in the chain and borks when it sees the expired cert).
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Ben Tasker
https://www.bentasker.co.uk