Probably time to find out how current your OS are. Some distros were kind of slow on the fix for:
Old Let’s Encrypt Root Certificate Expiration and OpenSSL 1.0.2 (which breaks mono as well…)
Error in updater - Trust Failure - SSL error and many other topics have directions for various OS.
Generally I’m looking for Duplicati, which might be idle, so I use ps -ef | grep Duplicati
I know there are threads inside processes, but the screenshot here has PID (but oddly similar).