Ring repository no longer has release file (Linux Mint Update Manager )
Linux Mint 19.2 Update Manager states: The repository 'https://dl.ring.cx/ring-nightly/ubuntu_18.04 ring Release' no longer has a Release file.
Here is an excerpt from running apt update in terminal:
Err:15 https://dl.ring.cx/ring-nightly/ubuntu_18.04 ring Release Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 192.252.140.237 443] Reading package lists... Done E: The repository 'https://dl.ring.cx/ring-nightly/ubuntu_18.04 ring Release' no longer has a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default.
Attached screenshot from Linux Mint Update Manager.