Upgrading nginx to latest stable 1.20 but reverts to 1.18 when reinstalling modules in Ubuntu 18.04 [closed]

I installed Nginx 1.20.1 by following the following this guide: here. I was able to upgrade to version 1.20 but during the upgrade process it removed a few modules like the following:

libnginx-mod-http-auth-pam 
libnginx-mod-http-cache-purge 
libnginx-mod-http-dav-ext

When reinstalling the modules(sudo apt-get install -y), it would uninstall v1.20 and go back to 1.18, I tried removing the modules before running the upgrade process but the same will still occur.

Any help is appreciated

nginx.org packaging of nginx and Ubuntu packaging are not equal and they are not compatible.

You need to either compile the additional modules for nginx 1.20 yourself, or find a source that includes these modules for v1.20.