the requested PHP extension curl is missing from your system

El Problema

lenin@BB8:~/www/sistemayii2$ composer install
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.

Problem 1
– Installation request for linslin/yii2-curl 1.0.10 -> satisfiable by linslin/yii2-curl[1.0.10].
– linslin/yii2-curl 1.0.10 requires ext-curl * -> the requested PHP extension curl is missing from your system.

To enable extensions, verify that they are enabled in those .ini files:
– /etc/php5/cli/php.ini
– /etc/php5/cli/conf.d/05-opcache.ini
– /etc/php5/cli/conf.d/10-pdo.ini
– /etc/php5/cli/conf.d/20-gd.ini
– /etc/php5/cli/conf.d/20-json.ini
– /etc/php5/cli/conf.d/20-pdo_pgsql.ini
– /etc/php5/cli/conf.d/20-pgsql.ini
– /etc/php5/cli/conf.d/20-readline.ini
You can also run `php –ini` inside terminal to see which files are used by PHP in CLI mode.

La solución

Instalar el soporte para CURL de PHP

#aptitude install php5-curl