Hi @astrava,
is just a warning. This is not what’s preventing Apache from successfully restarting.
Is there a different daemon currently listening on port 80 or is it just an errant/orphan Apache proc that cannot be stopped with SIGTERM? If the former, need to either stop it or set up Apache on a diff port, if the latter, try sending SIGKILL to all currently running Apache procs and then make sure restarting Apache with the init script works as expected. Once done, you can re-run the config script.