Nginx won't start on Omnibus Install - (possibly complexity on my end)

Troubleshooting
1

Summary
Nginx fails to start during omnibus install, due to Port 80 already being in use

Steps to reproduce
Installing on Ubuntu 24.04.1
following guide on Install Mattermost Omnibus - Mattermost documentation

Initial Failure due to i386/amd64 architecture, fixed by modifying mattermost.list, pgdb.list and nginx.list to include arch=amd64

This allows install to complete, until last stages.

Expected behavior
Install as per instructions

Observed behavior
Failed with;
fatal: [localhost]: FAILED! => {“changed”: false, “msg”: “Unable to start service nginx: Job for nginx.service failed because the control process exited with error code.\nSee "systemctl status nginx.service" and "journalctl -xeu nginx.service" for details.\n”}

systemctl status nginx.service shows;
nginx[44341]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx[44341]: nginx: [emerg] still could not bind()

This is expected, as this ubuntu is already hosting a web server on port 80.

How can I repeat the final stages of setup, while providing a seperate port number?
also, I operate my own CA on the network; is there an easy way to “untangle” the sue of LetsEncrypt and certbot so that I can use my own manually issued certs?

2

There might be an mmomni option to change that, or just find the nginx.conf file and set a different port in it.

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