I'm writing a program that needs to download GPG keys for various distributions to do unattended net installs. To do this securely and in an automated way, I need to download the key via HTTPS, which means "gpg --recv-keys" isn't an option. Other distributions (e.g., Fedora) make their keys available on their websites via HTTPS (e.g., <https://fedoraproject.org/static/E8E40FDE.txt>), but I can't find the Ubuntu key file anywhere on ubuntu.com. Does anyone know where I can get it via HTTPS?