diff -u b/core/modules/update/update.api.php b/core/modules/update/update.api.php
--- b/core/modules/update/update.api.php
+++ b/core/modules/update/update.api.php
@@ -83,7 +83,7 @@
  * @see update_calculate_project_data()
  */
 function hook_update_status_alter(&$projects) {
-  $settings = config('update.settings')->get('advanced_project_settings');
+  $settings = config('update_advanced.settings')->get('projects');
   foreach ($projects as $project => $project_info) {
     if (isset($settings[$project]) && isset($settings[$project]['check']) &&
         ($settings[$project]['check'] == 'never' ||
diff -u b/core/modules/update/update.install b/core/modules/update/update.install
--- b/core/modules/update/update.install
+++ b/core/modules/update/update.install
@@ -77,6 +77,10 @@
  * Implements hook_uninstall().
  */
 function update_uninstall() {
+  // @todo D8: Convert to new state storage.
+  variable_del('update_last_check');
+  variable_del('update_last_email_notification');
+
   $queue = queue('update_fetch_tasks');
   $queue->deleteQueue();
 }