install package login with linkedin

I'm trying to install oauth-5-laravel package for my laravel 5 project, but I'm getting the error when I'm trying to run the command composer update in ubuntu terminal.

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - elasticsearch/elasticsearch v1.4.1 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.4.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.3.4 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.3.3 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.3.2 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.3.1 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.3.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.2.2 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.2.1 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.2.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.1.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.0.2 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.0.1 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - elasticsearch/elasticsearch v1.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - fairholm/elasticquent v1.0.0 requires elasticsearch/elasticsearch ~1.0 -> satisfiable by elasticsearch/elasticsearch[v1.0, v1.0.1, v1.0.2, v1.1.0, v1.2.0, v1.2.1, v1.2.2, v1.3.0, v1.3.1, v1.3.2, v1.3.3, v1.3.4, v1.4.0, v1.4.1].
    - Installation request for fairholm/elasticquent 1.0.* -> satisfiable by fairholm/elasticquent[v1.0.0].

so how can I resolve this problem? thanks in advance.

via Chebli Mohamed