Can't Access Debian Mirrors

If you are installing your PTK from the ISO and the network the PTK is deployed into does not have direct Internet access, you may encounter an error that indicates the Debian archive mirrors could not be reached:

If this happens, skip past this stage of the installation by using your keyboard's arrow keys to select "<Go Back>" from the available options, and when prompted select "<Yes>" to confirm that you want to continue without a network mirror:

Installation will proceed and will complete normally.