How to Install NextCloud 15 on Ubuntu 18.04

Nextcloud is a free and open source, self-hosted file share and communication platform based on PHP. It is a great alternative to some of the popular services of this type, such as Dropbox, Google Drive, OwnCloud, etc??? With Nextcloud you can easily store the data on your Ubuntu 18.04 VPS, create and manage your contacts, calendars, todo lists, and much more. In this tutorial, we will install Nextcloud version 15 on an Ubuntu 18.04 VPS, which is a major release and it comes with a lot of new features and improvements.