Starting installation

Varbase 8.4.27 - Drupal 8.5.8

1. Upgrade media_entity to version 8.x-2.0-beta2 (supports drupal 5.x)

2. Apply the patch undefined_function-2925498-2.patch found on https://www.drupal.org/project/media_entity/issues/2925498

3. Apply the patch core fails on absent column revision_uid found on https://www.drupal.org/project/media_entity/issues/2918172

4. Add the modules media_entity_actions, media_entity_generic

5. Run drush mecu to find out if your installation is ready to migrate the media module (hint: it is not)

6. Upgrade the modules as requested. In my case I upgreaded: config_perms, video_embed_field, varbase_media, varbase_core, varbase_bootstrap_paragraphs and varbase_carousels i downloaded the newest 8.6x version of the varbase modules

7. Update to the newest version of varbase:8.6x

8. Modify the file docroot/modules/contrib/varbase_media/varbase_media.module by commenting line 275:

   Override::pluginClass($sources['oembed:video'], VarbaseMediaRemoteVideo::class);

9. Run drush cr

10. Run drush updb, and your project will be migrated from media_entity to media core! (I did not lose any data/configuration on first inspection). 10b. (Optional) If you are running a local instance with defaults you might exaust your memory. Go to your settins.php and add: ini_set('memory_limit', '-1');

11. Run a full upgrade by updating your composer.json and running composer update (delete vendor and composer.lock)

12. Re-install panelizer module

13. Run drush cr

14. Run drush updb

15. Run test to make sure everything is working and all your patches are migrated (acquia_search for me) . Disable media_entity, memedia_entity_actions, media_entity_generic and panelizer

16. Get yourself a 🍺👍

Congratz you should be running on your new and shinning installation using Media core.