The upgrade to Drupal 9 was settled at the 14th of November 2021. The complete task is here described:
Install Upgrade Status Modul
Uninstall and remove unused Themes (Bartik, Barrio based Themes)
Upgrade Modules:
• backup_migrate
• better_exposed_filters
• charts
• insert_block
• libraries
• search_api
• webform
Remove Module Missing Message Fixer with composer
Remove Patch for insert_block modul
Uninstall and remove Markdown. The Markdown module interferes with insert_view_adv
Create again Text Format „Full HTML“ as it get’s removed when uninstalling the markdown module!!
Move jcarousell to custom and remove from composer
Leave module insert_view_adv untouched
Update module Real name to 2.0.0-beta1
Update modul Single Date Time Picker to 8.x-1.8-beta1
Update modul Webform to 6.1.0
Fix open errors still shown in upgrade status report
Update drupal 8 to Drupal 9 with composer and drush:
chmod 777 web/sites/default
chmod 666 web/sites/default/*settings.php
chmod 666 web/sites/default/*services.yml
composer require 'drupal/core-recommended:^9' 'drupal/core-composer-scaffold:^9' 'drupal/core-project-message:^9' --update-with-dependencies --no-update
composer update
Remove 4 drupal patches from composer.json after update:
https://www.drupal.org/files/issues/2020-11-18/core-8.9.8-references_upgrade_path-2814953-85.patch
https://www.drupal.org/files/issues/2020-09-30/2429699-351--on-8_9_x.do-not-test.patch
https://www.drupal.org/files/issues/2020-07-09/core-ajaxload-1988968-195.patch
https://www.drupal.org/files/issues/2020-09-21/2836054-50.patch
drush updatedb
chmod 755 web/sites/default
chmod 644 web/sites/default/*settings.php
chmod 644 web/sites/default/*services.yml
Reinstall module Missing Message Fixer with composer for Drupal 9
Issues:
Insert Views doesn’t work with leaflet views => Remove the two views from node 9427 and use blocklayout to place these two views
Check that the SVG images in header and footer still show.
