OwnCloud server provides a self-hosted cloud storage service… OwnCloud desktop app is the graphical client specializing in synchronizing with cloud storage provided by ownCloud. To allow client computers to connect to OwnCloud servers, they’ll have to install the OwnCloud desktop client which provides transparent access to data on any storage.
Use the desktop clients to keep your files synchronized between your OwnCloud server and your desktop. It supports Windows, Mac OS, and Linux systems.
If you want your files and data synchronized across all your devices, you’ll want to install the client.
Whether you’re a small or large enterprise, the OwnCloud desktop client can help your team communicate and collaborate and these conversations will be available on the desktop, mobile devices, and everywhere you have the OwnCloud client installed.
OwnCloud desktop client enables productivity across any platform, whether in the office or on the road, to share, collaborate and communicate across organizational boundaries.
For more about OwnCloud, visit its homepage.
When you’re ready to install the OwnCloud client app for Linux follow the steps below:
Below are two options available when installing the OwnCloud desktop app on Ubuntu desktops…. You can select either one to get it installed…
Install OwnCloud Desktop App via Repository
To install the OwnCloud client app using its repository, simply run the commands below to add the repository to your Ubuntu desktop.
Then update and install the client. To do that, run the commands below to add your respective system repository:
Ubuntu 18.04 LTS
sudo sh -c "echo 'deb http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_18.04/ /' > /etc/apt/sources.list.d/isv:ownCloud:desktop.list" sudo apt-get update
Ubuntu 16.04 LTS
sudo sh -c "echo 'deb http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.04/ /' > /etc/apt/sources.list.d/isv:ownCloud:desktop.list" sudo apt-get update
After adding the repository above, run the commands below to install the client.
sudo apt-get install owncloud-client
After that, the client should be installed and ready to use… To launch the client, go to the Activities Overview and search OwnCloud and launch it.
When the app opens, type in the OwnCloud server address and connect to it. From there all your files and folder should be synchronized to the desktop.

Install OwnCloud Desktop App via DEB
OwnCloud App can also be installed manually from its DEB package. This might be an easier way to do it for those who are not familiar with the command line.
To install from its DEB package, go to the website link below and download the correct version for your system.

When prompted, click Save File to save the file to your desktop. usually in the Downloads folder of your home directory.

After that, browse to your Downloads folder and right-click the file then select Open With Software Install

When the Software install app opens, click Install to install the client.

After that, the client should be installed and ready to use. To launch the client, go to the Activities Overview and search OwnCloud and launch it.
When the app opens, type in the OwnCloud server address and connect to it. From there all your files and folder should be synchronized to the desktop.
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Great tutorial.
You forgot
$ sudo apt-key adv –keyserver keyserver.ubuntu.com –recv 4ABE1AC7557BEFF9