I have installed Nginx using the following repo:

```
deb http://nginx.org/packages/mainline/ubuntu bionic nginx

```

I now need to install Phusion Passenger which is telling me that unless I have installed from the official Ubuntu repo I will need to recompile the Passenger module etc.

I have tried to find where IF ANY is the Ubuntu 'official' repo for Nginx, and not succeeded.

How can I find the 'official' Ubuntu 18.04 Nginx repo?