This article introduces how to install the ownCloud client from the command line on Ubuntu 18.04 Linux PC or server.
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
sudo apt-get install owncloud-client