problem solved.

I use the following command in console and created the missing tables:

$ php bin/console uvdesk:configure-helpdesk

My installation of UVdesk on ubuntu stuck at step 4 with following error:

Uncaught PHP Exception Doctrine\DBAL\Exception\TableNotFoundException: "An exception occurred while executing 'SELECT t0.id AS id_1, t0.code AS code_2, t0.description AS description_3 FROM uv_support_role t0 WHERE t0.code = ? LIMIT 1' with params ["ROLE_SUPER_ADMIN"]: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'uvdeskdb.uv_support_role' doesn't exist" at /var/www/html/helpdesk-project/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php line 42

I login to mysql and find that there is only one table: "migration_versions" in there with no record. Really need help on this. Many Thanks!