- Download a 
Release.keyfile if there's no key file in a keyring yet, and save it into a.gpgfile. gpg --import /path/to/file- The above command will display key ID. Use it to export as an armored key:
gpg --export --armor <keyid> - Create a 
.sourcesfile, indenting the key and the endmarker with one space and prefixing it with a line containing a dot (.). Example: 
Types: deb
URIs: http://download.opensuse.org/repositories/home:/Alexx2000/xUbuntu_25.04/