How do I retrieve the keys so I can install virtualmin on Debian/apt-get

W: GPG error: virtualmin-universal Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY E8DD3FA0A0BDBCF9
root@debian:~# gpg --keyserver --recv-key E8DD3FA0A0BDBCF9
gpg: requesting key A0BDBCF9 from hkp server
gpgkeys: key E8DD3FA0A0BDBCF9 not found on keyserver
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

Get the aove when trying to retrieve the pubkeys as usual