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Another thing looks like this works now.. apt-get install webmin --fix-missing --fix-missing installed the following missing packages libauthen-pam-perl libio-pty-perl

Its finally working. I think it might be openjdk-8-headless install that installed java cacerts. Just guessing.

I dont think that is the issue. curl -v https://download.webmin.com/ was successful. I guess you can just install a ubuntu 21.04 as VM and test it, you probably will see what the real issue is. I cant really figure it out.

I dont think that is the issue. curl -v https://download.webmin.com/ was successful.

I can access it via browser as well as wget. As you can see downloading jcameron-key.asc worked fine.

Yep, looks like it. That IP in the error message is download.webmin.com. So probably not the issue with pgp key.

By the way here is what I did for APT key replacement. May be the install instructions need to be updated as soon apt-key will be removed in the subsequent ubuntu releases. Create a keyring directory that only root has access. mkdir -p /usr/share/keyrings De armor the gpg ascii key and save it the above directory wget -O- https://download.webmin.com/jcameron-key.asc | gpg --dearmor | sudo tee /usr/share/keyrings/webmin-archive-keyring.gpg Now create webmin.list file to sources vi /etc/apt/sources.list.d/webmin.list...

FYI, it still gets the same error after doing the above. Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 104.207.151.13 443] Fetched 181 kB in 8s (22.4 kB/s)