php artisan migrate not working

i install unbutu 18.04 when i try to php artisan migrate then error like

Illuminate\Database\QueryException  : could not find driver (SQL: select * from information_schema.tables where table_schema = pg_management and table_name = migrations)

at      /opt/lampp/htdocs/pg_final/pgmanagment/vendor/laravel/framework/src/Illuminate/Database/Connection.ph   p:665
    661|         // If an exception occurs when attempting to run a query, we'll format the error
    662|         // message to include the bindings with SQL, which will make this exception a
    663|         // lot more helpful to the developer instead of just the database's errors.
    664|         catch (Exception $e) {
> 665|             throw new QueryException(
    666|                 $query, $this->prepareBindings($bindings), $e
    667|             );
    668|         }
669| 

Exception trace:

1 PDOException::("could not find driver") /opt/lampp/htdocs/pg_final/pgmanagment/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:70

2 PDO::__construct("mysql:host=127.0.0.1;port=3306;dbname=pg_management", "root", "", []) /opt/lampp/htdocs/pg_final/pgmanagment/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:70

Please use the argument -v to see more details.

i also change in php.ini file

extension=php_pdo_mysql.dll add extension=pdo_mysql.so

after restart apache

but same error please help me out