diff --git b/core/modules/dashboard/dashboard.module a/core/modules/dashboard/dashboard.module
index 889af83..1464576 100644
--- b/core/modules/dashboard/dashboard.module
+++ a/core/modules/dashboard/dashboard.module
@@ -298,7 +298,7 @@ function dashboard_admin($launch_customize = FALSE) {
         drupal_get_path('module', 'dashboard') . '/dashboard.js',
         array('data' => $js_settings, 'type' => 'setting'),
       ),
-      'library' => array(array('system', 'ui.sortable')),
+      'library' => array(array('system', 'jquery.ui.sortable')),
     ),
   );
   return $build;
diff --git b/core/modules/locale/lib/Drupal/locale/Tests/LocaleLibraryInfoAlterTest.php a/core/modules/locale/lib/Drupal/locale/Tests/LocaleLibraryInfoAlterTest.php
index acfa01b..2e1ae8c 100644
--- b/core/modules/locale/lib/Drupal/locale/Tests/LocaleLibraryInfoAlterTest.php
+++ a/core/modules/locale/lib/Drupal/locale/Tests/LocaleLibraryInfoAlterTest.php
@@ -32,7 +32,7 @@ class LocaleLibraryInfoAlterTest extends WebTestBase {
      * @see locale_library_info_alter()
      */
   public function testLibraryInfoAlter() {
-    drupal_add_library('system', 'ui.datepicker');
+    drupal_add_library('system', 'jquery.ui.datepicker');
     $scripts = drupal_get_js();
     $this->assertTrue(strpos($scripts, 'locale.datepicker.js'), t('locale.datepicker.js added to scripts.'));
   }
diff --git b/core/modules/locale/locale.module a/core/modules/locale/locale.module
index 4ae073d..ce20b59 100644
--- b/core/modules/locale/locale.module
+++ a/core/modules/locale/locale.module
@@ -425,7 +425,7 @@ function locale_js_alter(&$javascript) {
  * Provides the language support for the jQuery UI Date Picker.
  */
 function locale_library_info_alter(&$libraries, $module) {
-  if ($module == 'system' && isset($libraries['ui.datepicker'])) {
+  if ($module == 'system' && isset($libraries['jquery.ui.datepicker'])) {
     $language_interface = drupal_container()->get(LANGUAGE_TYPE_INTERFACE);
     // locale.datepicker.js should be added in the JS_LIBRARY group, so that
     // this attach behavior will execute early. JS_LIBRARY is the default for