Ubuntu 14.04 Trusty LTS Epson Printer PX-S840 Driver Installation
The linked Tutorial shows you How to Install Driver in Epson Printer PX-S840 on Ubuntu 14.04 Trusty Tahr LTS i386/amd64 Linux.
For the Epson Printers All-in-One Models you’ll Find also a Guide to Quick Start with Scanner for Ubuntu 14.04 Trusty LTS.
Install Epson PX-S840 Printer in Ubuntu 14.04 Trusty LTS