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?
The bionic repo should be
deb http://archive.ubuntu.com/ubuntu bionic
After which you should put your categories (like main multiverse..)
Web url here: http://archive.ubuntu.com/ubuntu/dists/bionic/
You probably want nginx-full from universe
https://packages.ubuntu.com/bionic/nginx-full
deb http://archive.ubuntu.com/ubuntu bionic main universe
deb-src http://archive.ubuntu.com/ubuntu bionic main universe
This random forum post from ubuntuforums has a good post on what the full contents of your sources.lst should be and a sources generator: https://ubuntuforums.org/showthread.php?t=2398031#post13789955