Hi @stephenc, Katello 3.16 will not be supported on CentOS 8, as pulp 2 is not available for it. I would suggest that you try running on CentOS 7 for now since it will not be possible to install Katello on CentOS 8 until pulp2 is dropped in Katello 4.0, currently scheduled for release around March 2021 (New Katello release schedule & Pulp 3 Migration Update).
