I just installed nextcloud on my Ubuntu Server 20.04 (local network). The installation finished without problems. Using this tutorial https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-nextcloud-on-ubuntu-20-04 so I installed
sudo snap install nextcloud
setup password
sudo nextcloud.manual-install sammy password
open ports and created a self signed cert
sudo ufw allow 80,443/tcp
sudo nextcloud.enable-https self-signed
then I tried login into web interface, and I get "This site can’t be reached" page. I'm using
https://ip_address
https://ip_address/nextcloud
none work... any help appreciated