ubuntu中php.ini的路径和其他linux不一样，ubuntu的路径为：/etc/php5/apache2/php.ini，sudo vi /etc/php5/apache2/php.ini
1、查找 post_max_size，指通过表单POST给PHP的所能接收的最大值，包括表单里的所有值，默认为8M，看你自 己需要进行改变。

This guide provides step by step instructions for installing a full featured LAMP stack on an Ubuntu 12.04 (Oneiric) system.

In this guide, you will be instructed on setting up Apache, MySQL, and PHP. If you don't feel that you will need MySQL or PHP, please don't feel obligated to install them. Make sure you're logged into your Linode as the "root" user via SSH before proceeding with these instructions.