GNU/Linux Ubuntu 18.04 Epson ET-16680 Printer Setup – Step by step Guide
How to Install Epson ET-16680 Printer/Scanner on Ubuntu 18.04 Bionic LTS GNU/Linux desktop – Step by step Tutorial.
And to Install Epson ET-16680 Printer on Ubuntu Bionic you need to Setup the Proprietary Driver.
Moreover, using the Epson Printer Utility Software, you can check Ink Levels, View Error and other Status…
Especially relevant: to achieve the Setup follow the included instructions on How to Add ET-16680 Printer and Get Started Scanning.

GNU/Linux Ubuntu 18.04 Epson ET-16680 Printer Installation Guide