OwnCloud is an open-source, cloud-based, file hosting service that you can install on Ubuntu.
OwnCloud offers a quick installation process. You can access your files from most major operating systems, browsers, and mobile devices.

Steps:

1 - Update your system:

sudo apt update && sudo apt upgrade

2 - Install ownCloud - Add the repository key to apt, and install ownCloud:

sudo wget -nv https://download.owncloud.org/download/repositories/9.1/Ubuntu_16.04/Release.key -O Release.key
sudo apt-key add - < Release.key
sudo sh -c "echo 'deb http://download.owncloud.org/download/repositories/9.1/Ubuntu_16.04/ /' > /etc/apt/sources.list.d/owncloud.list"
sudo apt update
sudo apt install owncloud

3 - Configure MySQL

Log in to your MySQL database, and enter your root password:

mysql -u root -p

Create a new database for ownCloud, and replace "your_password" with a new password:

CREATE DATABASE ownCloud;
CREATE USER ownCloud@localhost;
SET PASSWORD FOR 'ownCloud'@'localhost' = PASSWORD('your_password');

Assign the new user to the database:

GRANT ALL PRIVILEGES ON ownCloud.* to ownCloud@localhost;
FLUSH PRIVILEGES;
exit;

Log into MySQL as the newly created user:

mysql -u ownCloud -p

Check the current user in MySQL:

SELECT current_user();

+--------------------+
| current_user()     |
+--------------------+
| ownCloud@localhost |
+--------------------+
1 row in set (0.00 sec)

4 - Create an Administrator Account:

Point your browser to ip_address_or_domain/owncloud, create an administrator account and enter the database login information:

Now your done, Welcome to ownCloud:

If you have any further questions, please don't hesitate to contact me

Thank you for reading and enjoy!