Solution to the problem (do everything with root / sudo):
- Run install.sh
- Start ncp-config --> CONFIG
- Run nc-init
- Run nc-trusted-domains
- Run nc-webui
- Go to https://YOURIP/activate and click activate
Now you can go to https://YOURIP:443 to reach Nextcloud and to https://YOURIP:4443 to reach NCP WebUI.
Warning: NCP has the “_” character pre-filled in password form fields of nc-admin and nc-passwd. You have to actively remove it, otherwise your passwords won’t be correct.