After trying and testing Duplicator Plugin, I found that everything is correct, except that Duplicator doesn't see the wp-config.php that is one level above of the default location, this is a security practice recommended by WP Official Codex. You should suggest to the plugin Team fix this issue.
Steps to migrate a site using Duplicator Plugin:
Now you can create a new package in Duplicator.
After following all the steps above you should see your new site running as expected. Optionally and suggested, you should move again your new wp-config file one level above. sudo mv /var/www/domain.com/htdocs/wp-config.php /var/www/domain.qrokes.com/wp-config.php
Please, tell me if it works for you.
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