I’m pretty new to Drupal and I’m trying to update a website from 8.0.0 to 8.6.1.

I’ve followed the guide here: https://www.drupal.org/docs/8/update/update-core-via-composer

The composer part went pretty well. However, when I run the command:

drush updatedb 

I get the following error:

Command updatedb needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command. The drush command 'updatedb' could not be executed. 

I’ve read online that I had to use cc all first, but when I do:

drush cc all 

I get the following:

No Drupal site found, only 'drush' cache was cleared. 

I thought that I might have to update my Drush version since I was running on 8.1.17 because version 9.x was not supporting Drupal 8.0.0. Therefore, I updated to 9.4.0.

Now when I execute the updatedb command, I get the following:

Bootstrap failed. Run your command with -vvv for more information. 

And the stacktrace:

Exception trace:  DrushBootBootstrapHook->initialize() at /root/.composer/vendor/consolidation/annotated-command/src/Hooks/Dispatchers/InitializeHookDispatcher.php:34  ConsolidationAnnotatedCommandHooksDispatchersInitializeHookDispatcher->callInitializeHook() at /root/.composer/vendor/consolidation/annotated-command/src/Hooks/Dispatchers/InitializeHookDispatcher.php:27  ConsolidationAnnotatedCommandHooksDispatchersInitializeHookDispatcher->initialize() at /root/.composer/vendor/consolidation/annotated-command/src/CommandProcessor.php:117  ConsolidationAnnotatedCommandCommandProcessor->initializeHook() at /root/.composer/vendor/consolidation/annotated-command/src/AnnotatedCommand.php:391  ConsolidationAnnotatedCommandAnnotatedCommand->initialize() at /root/.composer/vendor/symfony/console/Command/Command.php:217  SymfonyComponentConsoleCommandCommand->run() at /root/.composer/vendor/symfony/console/Application.php:964  SymfonyComponentConsoleApplication->doRunCommand() at /root/.composer/vendor/symfony/console/Application.php:248  SymfonyComponentConsoleApplication->doRun() at /root/.composer/vendor/symfony/console/Application.php:148  SymfonyComponentConsoleApplication->run() at /root/.composer/vendor/drush/drush/src/Runtime/Runtime.php:112  DrushRuntimeRuntime->doRun() at /root/.composer/vendor/drush/drush/src/Runtime/Runtime.php:41  DrushRuntimeRuntime->run() at /root/.composer/vendor/drush/drush/drush.php:66  require() at /root/.composer/vendor/drush/drush/drush:4 

And if I open my drupal website, I’m getting a fatal error:

Fatal error: Class ‘DrupalComponentUtilityString’ not found in /home/username/public_html/themes/name/name.theme on line 548

I’m executing all commands from the root of my drupal website. I’ve also tried to execute it from sites/default/.

Update

I’ve restored to the version before the update, then performed the following steps in order:

1. Updated composer.json to "drupal/core": "8.6.1"
2. Executed the command: composer update drupal/core --with-dependencies
3. Changed directory into the core/ folder
4. Executed the command: composer install in the subdirectory
5. Opened domain.com/update.php.

If I don’t perform step 3 & 4, I get an error when trying to load my website saying that it cannot load the file core/vendor/autoload.php.

Then I’m still getting the same fatal error as mentioned above.

composer.json

This is the original composer.json before the update.

{   "name": "drupal/drupal",   "description": "Drupal is an open source content management platform powering millions of websites and applications.",   "type": "project",   "license": "GPL-2.0+",   "require": {     "composer/installers": "^1.0.20",     "drupal/core": "8.0.0-beta6"   },   "minimum-stability": "dev",   "prefer-stable": true,   "repositories": [],   "config": {     "preferred-install": "dist",     "autoloader-suffix": "Drupal8"   },   "extra": {     "_readme": [       "This is an example file to show how a Drupal website can be managed via",       "Composer. It does not work out of the box but requires a Git subtree",       "split of the core directory to be added to the repositories",       "section above."     ]   } } 

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