Laravel 8 Update

laravel/ui Still works, but is considered legacy. Consider using Laravel Breeze or Laravel Jetstream.

Laravel 6 Update

Now that Laravel 6 is released, you need to install laravel/ui代码>.

composer require laravel/ui --dev
php artisan ui vue --auth

If you are using React or Bootstrap in your project, you can change vue to react or bootstrap (see Using React).

Then you need to perform migrations and compile the frontend

php artisan migrate
npm install && npm run dev

Source: Laravel Authentication Documentation

NOTE: Use the default User model and the Eloquent authentication driver only if you want to use scaffolding.

For Laravel >=6

composer require laravel/ui
php artisan ui vue --auth
php artisan migrate

Reference: Laravel Authentication Documentation

Looks like you are not using Laravel 5.2, these are the make commands available in L5.2, you are missing more than just the make:auth command

make:auth           Scaffold basic login and registration views and routes
    make:console        Create a new Artisan command
    make:controller     Create a new controller class
    make:entity         Create a new entity.
    make:event          Create a new event class
    make:job            Create a new job class
    make:listener       Create a new event listener class
    make:middleware     Create a new middleware class
    make:migration      Create a new migration file
    make:model          Create a new Eloquent model class
    make:policy         Create a new policy class
    make:presenter      Create a new presenter.
    make:provider       Create a new service provider class
    make:repository     Create a new repository.
    make:request        Create a new form request class
    make:seeder         Create a new seeder class
    make:test           Create a new test class
    make:transformer    Create a new transformer.

Make sure you have this dependency in your composer.json file

"laravel/framework": "5.2.*",

Then run

composer update