Build Failing - Can't find php7.1

I've spent a little bit of time locally trying to figure out what's going on.

In short, after adding the repository 'ppa:ondrej/php' I should be able to `apt-get install php7.1` but instead I get the following:

```
E: Unable to locate package php7.1
E: Couldn't find any package by glob 'php7.1'
E: Couldn't find any package by regex 'php7.1'
```