Sites being built by Composer, yet installed via the Drupal UI, are impacted by a bug identified in the following active thread on Drupal.org for:
You might encounter an error like the following during the installation process:
The website encountered an unexpected error. Please try again later. Drupal\Core\Config\UnmetDependenciesException: Configuration objects provided by standard have unmet dependencies: [...list of dependencies...] in Drupal\Core\Config\UnmetDependenciesException::create() (line 98 of core/lib/Drupal/Core/Config/UnmetDependenciesException.php). Drupal\Core\Config\UnmetDependenciesException::create('standard', Array) (Line: 485) Drupal\Core\Config\ConfigInstaller->checkConfigurationToInstall('module', 'standard') (Line: 132) Drupal\Core\ProxyClass\Config\ConfigInstaller->checkConfigurationToInstall('module', 'standard') (Line: 150) Drupal\Core\Extension\ModuleInstaller->install(Array, ) (Line: 83) Drupal\Core\ProxyClass\Extension\ModuleInstaller->install(Array, ) (Line: 1663) install_install_profile(Array) (Line: 709) install_run_task(Array, Array) (Line: 584) install_run_tasks(Array, NULL) (Line: 125) install_drupal(Object) (Line: 44)
- Sites created by downloading a Drupal zip file and installed manually
- Sites built by Composer and installed via Drush
- Drupal version 8.6.12 and earlier
*Please review the thread for the most up-to-date information on the breadth of impact.
The Drupal community is currently developing and testing patches to address the bug. We encourage you to test the latest patch available at https://www.drupal.org/project/drupal/issues/3045349 and post your results to that thread to help further the community's efforts to address this bug.