Added a more humane error message on no initial network (#3501)

* Added a more humane error message on no initial network

* Fixed ruff complaints

archinstall/__init__.py

@@ -40,6 +40,11 @@ def _fetch_arch_db() -> None:
 	try:
 		Pacman.run('-Sy')
 	except Exception as e:
+		error('Failed to sync Arch Linux package database.')
+		if 'could not resolve host' in str(e).lower():
+			error('Most likely due to a missing network connection or DNS issue.')
+		error('Run archinstall --debug and check /var/log/archinstall/install.log for details.')
+
 		debug(f'Failed to sync Arch Linux package database: {e}')
 		exit(1)