diff -u b/core/includes/install.core.inc b/core/includes/install.core.inc
--- b/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -554,6 +554,7 @@
  *   HTML output from the last completed task.
  */
 function install_run_tasks(&$install_state, callable $callback = NULL) {
+  drupal_check_cookie();
   do {
     // Obtain a list of tasks to perform. The list of tasks itself can be
     // dynamic (e.g., some might be defined by the installation profile,
@@ -561,7 +562,6 @@
  *   HTML output from the last completed task.
  */
 function install_run_tasks(&$install_state, callable $callback = NULL) {
-  drupal_check_cookie();
   do {
     // Obtain a list of tasks to perform. The list of tasks itself can be
     // dynamic (e.g., some might be defined by the installation profile,
@@ -2461,5 +2461,6 @@
     $domain = ini_get('session.cookie_domain') ? ltrim(ini_get('session.cookie_domain'), '.') : $_SERVER['HTTP_HOST'];
     $message = t('It seems your browser does not accept cookies. To set up this site, you need to accept cookies from this domain %domain.', array('%domain' => $domain));
-    drupal_set_message($message, 'error');
+    $messenger = \Drupal::messenger();
+    $messenger->addMessage($message);
   }
 }