Perhaps you should try what the error message tells you to do.
"This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register."
Did you try running subscription-manager?
also AFAIK
RedHat uses RPM has the primary package manager now.
"This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register."
Did you try running subscription-manager?
also AFAIK
RedHat uses RPM has the primary package manager now.
