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GPG and keyring issue




I just installed a new Debian 9 system on a reformatted disk in a multidisk system. I used the Netinstall cd from Debian. Installation went ok and I am sending this from the system. Problem is I tried to add the contrib and non-free repos to synaptic i.e. apt sources.list  I simply copied the sources.list file from a current working system that has no issues. The message below is what I get when I try to run apt update:

GPG error: http://deb.debian.org/debian stretch-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010The repository 'http://deb.debian.org/debian stretch-updates InRelease' is not signed.Updating from such a repository can't be done securely, and is therefore disabled by default.See apt-secure(8) manpage for repository creation and user configuration details.GPG error: http://security.debian.org stretch/updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9D6D8F6BC857C906 NO_PUBKEY 8B48AD6246925553The repository 'http://security.debian.org stretch/updates InRelease' is not signed.Updating from such a repository can't be done securely, and is therefore disabled by default.See apt-secure(8) manpage for repository creation and user configuration details.GPG error: http://deb.debian.org/debian stretch Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY EF0F382A1A7B6500The repository 'http://deb.debian.org/debian stretch Release' is not signed.Updating from such a repository can't be done securely, and is therefore disabled by default.See apt-secure(8) manpage for repository creation and user configuration details.GPG error: http://ftp.debian.org/debian stretch-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010The repository 'http://ftp.debian.org/debian stretch-backports InRelease' is not signed.

I have used Debian for years, and dont often use this list but this is a new issues to me and though I can find a lot of info, I have not found a solution. i did download the current keyrings and installed them, but that did not help. Just wondering if this is some new issue related to secure apt.
Thanks
John