Chef will pick dpkg because this is running on ubuntu. 

According to the docs:

> In many cases, it is better to use the package resource instead of this one. This is because when the package resource is used in a recipe, the chef-client will use details that are collected by Ohai at the start of the chef-client run to determine the correct package application. Using the package resource allows a recipe to be authored in a way that allows it to be used across many platforms. That said, there are scenarios where using an application-specific package is preferred.