How to install ssl non certbot non let's encrypt

you don’t need certbot installed for getting the snap encrypted. Nextcloud snap includes a service for automated HTTPS encryption and renewal using Lets Encrypt, self-signed certificates, or custom certificates.

be sure to remove certbot sudo snap remove --purge certbot --classic when using the included Nextcloud snap encryption service. you can’t have both services running!

Tip

read the docs Home Ā· nextcloud-snap/nextcloud-snap Wiki Ā· GitHub