Just say “No” when it asks for HTTPS then - it only sets up nginx if you say Yes. Apache isn’t suitable for AMP because it has relatively poor websockets support and isn’t as good at being a reverse proxy. But this doesn’t matter since if you select No it doesn’t use any external webserver at all and only uses the built in one.
Reading the output would have helped you here because it does say:
Apache2 is installed, which will conflict with nginx as required for AMPs reverse proxy - Aborting.
Either remove Apache2 and try again, or re-run this script and select ‘No’ when asked if you wish to use HTTPS