Laravel on Ubuntu SQLSTATE[HY000] [1045] Access denied for user 'myuser'@'localhost' (using password: YES)

I have Laravel 5.8 installed on Ubuntu 16.04. I have MySql. My .env file:

DB_CONNECTION=mysql
DB_HOST=localhost
DB_PORT=3306
DB_DATABASE=mydb
DB_USERNAME=myuser
DB_PASSWORD=aaaa

My config/database.php file:

'mysql' => [
            'driver' => 'mysql',
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'mydb'),
            'username' => env('DB_USERNAME', 'myuser'),
            'password' => env('DB_PASSWORD', 'aaaa'),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'strict' => true,
            'engine' => null,
        ],

I can log in into mysql with user myuser@localhost and password aaaa using command mysql -u myuser -p and in phpmyadmin. I did these commands:

php artisan config:clear
php artisan cache:clear
php artisan config:cache

But I still have error in my website:

SQLSTATE[HY000] [1045] Access denied for user 'myuser'@'localhost' (using password: YES)

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