Linux一键安装web环境全攻略（阿里云服务器） 安装 PHP扩展 fileinfo

Distributor ID: UbuntuDescription:    Ubuntu 14.04.2 LTSRelease:    14.04Codename:   trusty

PHP 5.5.9-1ubuntu4.9 (cli) (built: Apr 17 2015 11:44:57) Copyright (c) 1997-2014 The PHP GroupZend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies    with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies

现在网站需要安装PHP扩展 fileinfo

怎么安装呢

用的阿里的 linux_setup_1.4.1 一键安装