Webmin signature preventing apt update

OS type and version Ubuntu 22.04
Webmin version N/A

I installed Webmin a while ago to try it out and decided not to use it so I uninstalled it. Everything was working fine for a while after that but now when I try to run an apt update I get this error

Get:17 Index of /download/newkey/repository stable Release.gpg [819 B]
Err:17 Index of /download/newkey/repository stable Release.gpg
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 2D223B918916F2A2

I don’t have the repo installed anymore

ls /etc/apt/trusted.gpg.d/
deadsnakes-ubuntu-ppa.gpg deadsnakes-ubuntu-ppa.gpg~ google-chrome.gpg microsoft.gpg ubuntu-keyring-2012-cdimage.gpg ubuntu-keyring-2018-archive.gpg

Anyone have suggestions for where to look for anything left over from the install? Relative noob to linux so any suggestions would be appreciated