diff --git a/core/lib/Drupal/Core/Extension/ModuleInstaller.php b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
index 10fabd412a..9704b3262d 100644
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -194,6 +194,10 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
         // Update the kernel to include it.
         $this->updateKernel($module_filenames);
 
+        // In order to make installing transactional if anything uses routes.
+        \Drupal::getContainer()->set('router.route_provider.old', \Drupal::service('router.route_provider'));
+        \Drupal::getContainer()->set('router.route_provider', \Drupal::service('router.route_provider.lazy_builder'));
+
         // Allow modules to react prior to the installation of a module.
         $this->moduleHandler->invokeAll('module_preinstall', [$module]);
 
@@ -283,10 +287,6 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
         // @see https://www.drupal.org/node/2208429
         \Drupal::service('theme_handler')->refreshInfo();
 
-        // In order to make uninstalling transactional if anything uses routes.
-        \Drupal::getContainer()->set('router.route_provider.old', \Drupal::service('router.route_provider'));
-        \Drupal::getContainer()->set('router.route_provider', \Drupal::service('router.route_provider.lazy_builder'));
-
         // Allow the module to perform install tasks.
         $this->moduleHandler->invoke($module, 'install');
 
diff --git a/core/modules/content_translation/tests/modules/route_provider_install_test/route_provider_install_test.info.yml b/core/modules/content_translation/tests/modules/route_provider_install_test/route_provider_install_test.info.yml
new file mode 100644
index 0000000000..e2e6ff2e02
--- /dev/null
+++ b/core/modules/content_translation/tests/modules/route_provider_install_test/route_provider_install_test.info.yml
@@ -0,0 +1,6 @@
+name: 'Route provider install test'
+description: 'Helps test an insidious bug triggered by the url_generator maintaining a stale route provider.'
+type: module
+package: Testing
+version: VERSION
+core: 8.x
diff --git a/core/modules/content_translation/tests/modules/route_provider_install_test/route_provider_install_test.services.yml b/core/modules/content_translation/tests/modules/route_provider_install_test/route_provider_install_test.services.yml
new file mode 100644
index 0000000000..68ff1ac8db
--- /dev/null
+++ b/core/modules/content_translation/tests/modules/route_provider_install_test/route_provider_install_test.services.yml
@@ -0,0 +1,5 @@
+services:
+  plugin.manager.route_provider_install_test:
+    class: '\Drupal\route_provider_install_test\PluginManager'
+    parent: default_plugin_manager
+    arguments: ['@url_generator']
diff --git a/core/modules/content_translation/tests/modules/route_provider_install_test/src/PluginManager.php b/core/modules/content_translation/tests/modules/route_provider_install_test/src/PluginManager.php
new file mode 100644
index 0000000000..1fe2b5caff
--- /dev/null
+++ b/core/modules/content_translation/tests/modules/route_provider_install_test/src/PluginManager.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Drupal\route_provider_install_test;
+
+use Drupal\Component\Annotation\PluginID;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Plugin\DefaultPluginManager;
+use Drupal\Core\Routing\UrlGeneratorInterface;
+
+class PluginManager extends DefaultPluginManager {
+
+  /**
+   * PluginManager constructor.
+   *
+   * @param \Traversable $namespaces
+   *   An object that implements \Traversable which contains the root paths
+   *   keyed by the corresponding namespace to look for plugin implementations.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   A cache backend.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
+   * @param \Drupal\Core\Routing\UrlGeneratorInterface $url_generator
+   *   The URL generator.
+   */
+  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler, UrlGeneratorInterface $url_generator) {
+    parent::__construct('Plugin/RouteProviderInstallTest', $namespaces, $module_handler, NULL, PluginID::class);
+  }
+
+}
diff --git a/core/modules/content_translation/tests/src/Functional/RouteProviderInstallTest.php b/core/modules/content_translation/tests/src/Functional/RouteProviderInstallTest.php
new file mode 100644
index 0000000000..e09c405370
--- /dev/null
+++ b/core/modules/content_translation/tests/src/Functional/RouteProviderInstallTest.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\Tests\content_translation\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * @group content_translation
+ */
+class RouteProviderInstallTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = ['route_provider_install_test'];
+
+  /**
+   * Tests that the URL generator does not depend on a stale route provider.
+   *
+   * Currently, this fails with a RouteNotFoundException complaining that the
+   * entity.configurable_language.collection route does not exist. This route
+   * is provided by the Language module, which is a dependency of Content
+   * Translation, so it *should* exist by the time content_translation_install()
+   * tries to generate a URL from it.
+   *
+   * The problem is a confluence of several factors. route_provider_install_test
+   * provides a plugin manager which directly references the url_generator.
+   * This plugin manager is instantiated *before* module installation by the
+   * plugin.cache_clearer service, which is invoked by the module installer.
+   *
+   * Therefore, once the module installer reaches the point where it swaps out
+   * the old route provider for the lazy-building one, the plugin manager is
+   * still referencing the URL generator, which is still referencing the stale
+   * route provider, rather than the lazy-building one that the module installer
+   * has swapped in. So content_translation_install() fails while trying to
+   * generate the URL, since it's using a stale, non-lazy building route
+   * provider!
+   */
+  public function testInstallation() {
+    $this->container->get('module_installer')->install(['content_translation']);
+  }
+
+}