At this point, the Pi should be booted and you should be logged in via ssh or serial console.

Confirm you can “ping” out from the Pi to the internet at large:

If using the serial cable, and the ping does not respond, check that the Ethernet cable is properly seated at both ends, and that the router (or cable or DSL modem, etc.) are powered on and working for any other devices on the network.

Although WiFi is not yet configured, we can check for the existence of that hardware (e.g. if using a USB WiFi adapter):

If you see “wlan0” in the output, you’re in good shape.