When downloading Laravel, the vendor folder does not download, what should I do?

Question

ubuntu

I started learning Laravel when installing via composer and laravel/install the framework is downloaded but without the vendor folder, tell me how to fix it.
installation via Composer:

composer create-project --prefer-dist laravel/laravel blog

Installation via Laravel/install
laravel new blog
Screenshot of the downloaded framework

Answer 1

So composer installfor some reason it didn't work.
UPD: mbstring extension is missing.

Answer 2

There were two problems that xampp was running with php version 5.4.* and it was missing the mbstring extension.
thanks for the help