reverted:
--- b/examples.module
+++ a/examples.module
@@ -50,7 +50,6 @@
     'file_example' => 'file_example.fileapi',
     'hooks_example' => 'hooks_example.description',
     'js_example' => 'js_example.info',
-    'menu_example' => 'examples.menu_example',
     'node_type_example' => 'config_node_type_example.description',
     'page_example' => 'page_example_description',
     'pager_example' => 'pager_example.page',
diff -u b/menu_example/menu_example.routing.yml b/menu_example/menu_example.routing.yml
--- b/menu_example/menu_example.routing.yml
+++ b/menu_example/menu_example.routing.yml
@@ -24,7 +24,7 @@
     _controller: '\Drupal\menu_example\Controller\MenuExampleController::alternateMenu'
     _title: 'Menu Example: Menu in alternate menu'
   requirements:
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # The menu entry demonstrates the use of permissions to restrict access
 # to a particular path until and unless the requirement is met.
@@ -34,7 +34,7 @@
     _controller: '\Drupal\menu_example\Controller\MenuExampleController::permissioned'
     _title: 'Permissioned Route Example'
   requirements:
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # Only the user with the required permission will be able to access this route.
 examples.menu_example.permissioned_controlled:
@@ -72,7 +72,7 @@
     _controller: '\Drupal\menu_example\Controller\MenuExampleController::routeOnly'
     _title: 'Route only example'
   requirements:
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # These type of routes can be used to create webservices.
 examples.menu_example.callback:
@@ -81,7 +81,7 @@
     _controller: '\Drupal\menu_example\Controller\MenuExampleController::routeOnlyCallback'
     _title: 'Callback only'
   requirements:
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # Drupal 8's routes may include placeholder elements which designate places
 # where the URL contains dynamic values. In the controller method, this value
@@ -97,7 +97,7 @@
     arg1: ''
     arg2: ''
   requirements:
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # Title of this menu entry will be altered by controller method defined by
 # key '_title_callback'.
@@ -107,7 +107,7 @@
     _title_callback: 'Drupal\menu_example\Controller\MenuExampleController::backTitle'
     _controller: '\Drupal\menu_example\Controller\MenuExampleController::titleCallback'
   requirements:
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # A menu item entry to demonstrate use of parameters in routes.
 examples.menu_example.placeholder_argument:
@@ -116,7 +116,7 @@
     _title: 'Placeholder Arguments'
     _controller: '\Drupal\menu_example\Controller\MenuExampleController::placeholderArgs'
   requirements:
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # Parameters in routes can be used as placeholders arguments too.
 examples.menu_example.placeholder_argument.display:
@@ -126,7 +126,7 @@
     _controller: '\Drupal\menu_example\Controller\MenuExampleController::placeholderArgsDisplay'
   requirements:
     arg: \d+
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # Any route defined here can be altered. We can do so by defining a RouteSubscriber!
 example.menu_example.path_override:
@@ -135,7 +135,7 @@
     _title: 'Menu path that will be altered'
     _controller: '\Drupal\menu_example\Controller\MenuExampleController::pathOverride'
   requirements:
-    _access: 'TRUE'
+    _permission: 'access content'
 
 # Dynamic routes are implemented in a method. This method is added as a
 # 'route_callbacks'
diff -u b/menu_example/src/Controller/MenuExampleController.php b/menu_example/src/Controller/MenuExampleController.php
--- b/menu_example/src/Controller/MenuExampleController.php
+++ b/menu_example/src/Controller/MenuExampleController.php
@@ -4,8 +4,8 @@
 
 use Drupal\Core\Controller\ControllerBase;
 use Drupal\Core\Link;
-use Drupal\Core\Url;
 use Drupal\examples\Utility\DescriptionTemplateTrait;
+
 /**
  * Controller routines for menu example routes.
  *
@@ -62,8 +62,8 @@
    * @throws \InvalidArgumentException
    */
   public function permissioned() {
-    $url = Url::fromUri('internal:/examples/menu-example/permissioned/controlled');
-    $link = Link::fromTextAndUrl($this->t('examples/menu-example/permissioned/controlled'), $url)->toString();
+    $link = Link::createFromRoute($this->t('examples/menu-example/permissioned/controlled'),
+      'examples.menu_example.permissioned_controlled')->toString();
     return [
       '#markup' => $this->t('A menu item that requires the "access protected menu example" permission is at @link', ['@link' => $link]),
     ];
@@ -84,12 +84,12 @@
    * Demonstrates the use of custom access check in routes.
    *
    * @throws \InvalidArgumentException
-
+   *
    * @see \Drupal\menu_example\Controller\MenuExampleController::customAccessPage()
    */
   public function customAccess() {
-    $url = Url::fromUri('internal:/examples/menu-example/custom-access/page');
-    $link = Link::fromTextAndUrl($this->t('examples/menu-example/custom-access/page'), $url)->toString();
+    $link = Link::createFromRoute($this->t('examples/menu-example/custom-access/page'),
+      'examples.menu_example.custom_access_page')->toString();
     return [
       '#markup' => $this->t('A menu item that requires the user to posess a role of "authenticated" is at @link', ['@link' => $link]),
     ];
@@ -114,8 +114,8 @@
    * @throws \InvalidArgumentException
    */
   public function routeOnly() {
-    $url = Url::fromUri('internal:/examples/menu-example/route-only/callback');
-    $link = Link::fromTextAndUrl($this->t('examples/menu-example/route-only/callback'), $url)->toString();
+    $link = Link::createFromRoute($this->t('examples/menu-example/route-only/callback'),
+      'examples.menu_example.callback')->toString();
     return [
       '#markup' => $this->t('A menu entry with no menu link is at @link', ['@link' => $link]),
     ];
@@ -142,9 +142,9 @@
    */
   public function tabsPage($path, $title) {
     $secondary = substr_count($path, '/') > 2 ? 'secondary ' : '';
-    return array(
+    return [
       '#markup' => $this->t('This is the @secondary tab "@tabname" in the "basic tabs" example.', ['@secondary' => $secondary, '@tabname' => $title]),
-    );
+    ];
   }
 
   /**
@@ -162,20 +162,20 @@
    */
   public function urlArgument($arg1, $arg2) {
     // Perpare link for single arguments.
-    $url = Url::fromUri('internal:/examples/menu-example/use-url-arguments/one');
-    $link = Link::fromTextAndUrl($this->t('examples/menu-example/use-url-arguments/one'), $url)->toString();
+    $link = Link::createFromRoute($this->t('examples/menu-example/use-url-arguments/one'),
+      'examples.menu_example.use_url_arguments', ['arg1' => 'one'])->toString();
 
     // Prepare link for multiple arguments.
-    $urltwo = Url::fromUri('internal:/examples/menu-example/use-url-arguments/one/two');
-    $linktwo = Link::fromTextAndUrl($this->t('examples/menu-example/use-url-arguments/one/two'), $urltwo)->toString();
+    $linktwo = Link::createFromRoute($this->t('examples/menu-example/use-url-arguments/one/two'),
+      'examples.menu_example.use_url_arguments', ['arg1' => 'one', 'arg2' => 'two'])->toString();
 
     $markup = $this->t('This page demonstrates using arguments in the url. For example, access it with @link for single argument or @linktwo for two arguments in URL', ['@link' => $link, '@linktwo' => $linktwo]);
 
     if (!empty($arg1)) {
-      $markup .= '<div>' . $this->t('Argument 1 = @arg', array('@arg' => $arg1)) . '</div>';
+      $markup .= '<div>' . $this->t('Argument 1 = @arg', ['@arg' => $arg1]) . '</div>';
     }
     if (!empty($arg2)) {
-      $markup .= '<div>' . $this->t('Argument 2 = @arg', array('@arg' => $arg2)) . '</div>';
+      $markup .= '<div>' . $this->t('Argument 2 = @arg', ['@arg' => $arg2]) . '</div>';
     }
 
     return [
@@ -201,7 +201,10 @@
    * @see \Drupal\menu_example\Controller\MenuExampleController::titleCallback()
    */
   public function backTitle() {
-    return \Drupal::currentUser()->getDisplayName();
+    $name = \Drupal::currentUser()->getDisplayName();
+    return [
+      '#markup' => $this->t('The new title is your username: @name', ['@name' => $name]),
+    ];
   }
 
   /**
@@ -213,8 +216,8 @@
    * @see https://www.drupal.org/docs/8/api/routing-system/using-parameters-in-routes
    */
   public function placeholderArgs() {
-    $url = Url::fromUri('internal:/examples/menu-example/placeholder-argument/3343/display');
-    $link = Link::fromTextAndUrl($this->t('examples/menu-example/placeholder-argument/3343/display'), $url)->toString();
+    $link = Link::createFromRoute($this->t('examples/menu-example/placeholder-argument/3343/display'),
+      'examples.menu_example.placeholder_argument.display', ['arg' => 3343])->toString();
     return [
       '#markup' => $this->t('Demonstrate placeholders by visiting @link', ['@link' => $link]),
     ];
diff -u b/menu_example/templates/description.html.twig b/menu_example/templates/description.html.twig
--- b/menu_example/templates/description.html.twig
+++ b/menu_example/templates/description.html.twig
@@ -1,6 +1,6 @@
 {#
 
-Description text for the Block Example.
+Description text for the Menu Example.
 
 #}
 
diff -u b/menu_example/tests/src/Functional/MenuExampleTest.php b/menu_example/tests/src/Functional/MenuExampleTest.php
--- b/menu_example/tests/src/Functional/MenuExampleTest.php
+++ b/menu_example/tests/src/Functional/MenuExampleTest.php
@@ -4,7 +4,7 @@
 
 use Drupal\Tests\BrowserTestBase;
 use Drupal\user\Entity\Role;
-use Drupal\user\RoleInterface;
+use Drupal\Core\Url;
 
 /**
  * Test the functionality for the menu Example.
@@ -21,7 +21,7 @@
    *
    * @var array
    */
-  public static $modules = array('menu_example');
+  public static $modules = ['menu_example'];
   /**
    * The installation profile to use with this test.
    *
@@ -46,30 +46,30 @@
     $this->assertSession()->pageTextContains(t("@name", ['@name' => $web_user->getUsername()]));
 
     // Now start testing other menu entries.
-    $this->drupalGet('examples/menu-example');
+    $this->drupalGet(Url::fromRoute('examples.menu_example'));
     $this->clickLink(t('Custom Access Example'));
     $this->assertSession()->pageTextContains(t('Custom Access Example'));
-    $this->drupalGet('examples/menu-example/custom-access/page');
+    $this->drupalGet(Url::fromRoute('examples.menu_example'));
     $this->assertSession()->statusCodeEquals(200);
     // Logout user to check denial of access.
     $this->drupalLogout();
-    $this->drupalGet('examples/menu-example/custom-access/page');
+    $this->drupalGet(Url::fromRoute('examples.menu_example'));
     $this->assertSession()->statusCodeEquals(403);
 
     // Check 'Permission Example' menu entry.
     $this->drupalLogin($web_user);
-    $this->drupalGet('examples/menu-example/permissioned');
+    $this->drupalGet(Url::fromRoute('examples.menu_example.permissioned'));
     $this->assertSession()->pageTextContains(t('Permissioned Example'));
-    $this->clickLink('examples/menu-example/permissioned/controlled');
+    $this->clickLink(Url::fromRoute('examples.menu_example.permissioned_controlled'));
     $this->assertSession()->statusCodeEquals(403);
     // Check access with appropriate permissions.
     $this->grantPermissions(Role::load(Role::AUTHENTICATED_ID), ['access protected menu example']);
-    $this->drupalGet('examples/menu-example/permissioned/controlled');
+    $this->drupalGet(Url::fromRoute('examples.menu_example.permissioned_controlled'));
     $this->assertSession()->statusCodeEquals(200);
 
     // Check Route only example entry.
     $this->clickLink(t('Route only example'));
-    $this->clickLink('examples/menu-example/route-only/callback');
+    $this->clickLink(Url::fromRoute('examples.menu_example.callback'));
     $this->assertSession()->pageTextContains('The route entry has no corresponding menu links entry');
 
     // Check links on Tabs landing page.
@@ -90,7 +90,7 @@
 
     // Now verify 'URL arguments' menu entry to be working with two arguments.
     $this->clickLink(t('URL Arguments'));
-    $this->drupalGet('examples/menu-example/use-url-arguments/one/two');
+    $this->drupalGet(Url::fromRoute('examples.menu_example.use_url_arguments', ['arg1' => 'one', 'arg2' => 'two']));
     $this->assertSession()->pageTextContains(t('Argument 1 = one'));
     $this->assertSession()->pageTextContains(t('Argument 2 = two'));