Installing with magento2 Composer - php extensions: ext-mcrypt * and ext-intl * missing

Question

I have tried to install magento2 in ubuntu 16.04 machine. I have followed these steps for install magento. When install composer then show these problems

 Problem 1
    - The requested PHP extension ext-gd * is missing from your system. Install or enable PHP's gd extension.
 Problem 2
    - The requested PHP extension ext-mcrypt * is missing from your system. Install or enable PHP's mcrypt extension.

How to solve these problem ?

Answer 1

Try these command in your shell

sudo apt-get install php7.0-gd
sudo apt-get install php7.0-ext-mcrypt

then try again install composer

composer install