Procedure on Installing NextCloud Docker

Prerequisites:

1. Install Portainer

• Installation guide
• Video Tutorial Or YouTube

2. Nginx Proxy Manager (Optional for reverse proxy)

• Installation guide
• Video Tutorial or YouTube

3.  Additional Prerequisites

• Instructions

4. NextCloud

• Instructions
• Docker Compose 
• Video Tutorial or YouTube
• Update

Other installations

• Instructions 
• Docker Installations

https://stackoverflow.com/questions/41133455/docker-repository-does-not-have-a-release-file-on-running-apt-get-update-on-ubun