Solution : laravel new blog3 Crafting application... Loading composer repositories with package information Installing dependencies (including require-dev) from lock file Your requirements could not be resolved to an installable set of packages.

https://stackoverflow.com/questions/43642493/laravel-project-creation-your-requirements-could-not-be-resolved-to-an-installa

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If you're running PHP 5 sudo apt-get install php5-mbstring If you're running PHP 7 sudo apt-get install php7.0-mbstring   Also, read Laravel's requirements: https://laravel.com/docs/5.4/installation There may be other dependencies you haven't installed: PHP >= 5.6.4 OpenSSL PHP Extension PDO PHP Extension Mbstring PHP Extension Tokenizer PHP Extension XML PHP Extension