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Magento 2 Installation failure
If I install Magento and then add Searchanise there is no problem while running "bin/magneto setup:upgrade".
[ERROR] Magento\Framework\Exception\LocalizedException: Invalid entity_type specified: customer in /var/www/html/vendor/magento/module-eav/Model/Config.php:409
The issue seems to reside in you events.xml. You have an observer on cms_page_save_after and when Magento_Cms installs its data the Magento_Customer module is not installed yet. This makes the observer crash and the installation fail.
To fix this issue you should put the observern in the etc/adminhtml/events.xml file instead so it only listens when the creating is made in Admin.
This resolved the issue for me.
We need to discuss this question with our developers and will get back to you once we get the results.
Unfortunately, we cannot tell what caused the issue. As we can see the error occurs in another extension during Magento installation process. However we are glad to hear that you managed to resolve the issue. Our developers will check installation process of Magento 2.2.6 in console.