If your VPS is running Ubuntu 14.04 LTS you might want to upgrade to the latest LTS release but you shouldn’t feel rushed to it because 14.04 will be supported until 2019. If you still feel you’d like to upgrade this guide will show you the steps to do it.
Unless you are leasing a dedicated server for your Liferay installation you need to understand that not all VPS hosting providers are the same. For VPS hosting providers both memory and CPU are precious commodity. There’s only so much memory and CPU cores that a single server can hold. This