Short answer for security updates repo : remove Components (main), leave it empty, and resync.
More informations here : Subscription Manager for Debian & Ubuntu on apt.atix.de - #46 by quba42
Short answer for security updates repo : remove Components (main), leave it empty, and resync.
More informations here : Subscription Manager for Debian & Ubuntu on apt.atix.de - #46 by quba42