How to to install composer in Ubuntu Linux

How to to install composer in Ubuntu Linux

 

Install composer in Ubuntu 10.4

curl -sS https://getcomposer.org/installer | php

mv composer.phar /usr/local/bin/composer

Run composer set timeout

COMPOSER_PROCESS_TIMEOUT=4000 composer update

or 

COMPOSER_PROCESS_TIMEOUT=4000 php composer.phar update