Register the request object in the installer so that the utility functions that now depend on it work.

core/includes/install.core.inc

@@ -3,6 +3,8 @@
 use Drupal\Core\Database\Database;
 use Drupal\Core\Database\Install\TaskException;
 
+use Symfony\Component\HttpFoundation\Request;
+
 /**
  * @file
  * API functions for installing Drupal.
@@ -261,6 +263,14 @@ function install_begin_request(&$install_state) {
 
   drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);
 
+  // A request object from the HTTPFoundation to tell us about the request.
+  $request = Request::createFromGlobals();
+
+  // Set the global $request object.  This is a temporary measure to
+  // keep legacy utility functions working.  It should be moved to a dependency
+  // injection container at some point.
+  request($request);
+
   // This must go after drupal_bootstrap(), which unsets globals!
   global $conf;