**Steps to reproduce**
* Use mw 1.28 alpha.
* Use postgres
*
Is run php maintenance/install.php --pass nyan TravisWiki admin --dbtype postgres -dbname traviswiki --dbuser postgres --dbpass <pass> --scriptpath ""
**Acutal results**
* it fail with
You can install MediaWiki.
Setting up database
PHP Fatal error: Uncaught MediaWiki\Services\ServiceDisabledException: Service disabled: DBLoadBalancerFactory in /var/www/html/phabricator/includes/services/ServiceContainer.php:340
Stack trace:
#0 /var/www/html/phabricator/includes/MediaWikiServices.php(500): MediaWiki\Services\ServiceContainer->getService('DBLoadBalancerF...')
#1 /var/www/html/phabricator/includes/exception/MWExceptionHandler.php(90): MediaWiki\MediaWikiServices->getDBLoadBalancerFactory()
#2 /var/www/html/phabricator/includes/exception/MWExceptionHandler.php(121): MWExceptionHandler::rollbackMasterChangesAndLog(Object(DBQueryError))
#3 [internal function]: MWExceptionHandler::handleException(Object(DBQueryError))
#4 {main}
thrown in /var/www/html/phabricator/includes/services/ServiceContainer.php on line 340
**Expected results**
* I expect that running this script should succeed and create the tables and setup the database.