Installing printer driver for Epson TM-T20ii on Ubuntu 16.04

I am using Ubuntu 16.04 on a machine as a POS. Once the Epson TM-T20ii printer is loaded, it comes up with the following error:

CUPS server error  

The CUPS error_log shows this error: client-error-document-format-not-supported...

I see that Epson supplies a driver called "TM-Intelligent Printer" that seems to cover all the bases. It comes down as tmx-cups-2.0.3.0.tar.gz so if you save it to your Downloads folder.

Copy each line of command below; paste into a terminal; hit the Enter key after each paste; move to the next line. The commands to install:

cd Downloads
tar -zxvf tmx-cups-2.0.3.0.tar.gz
cd tmx-cups
sudo ./install.sh

If you delete what you have in your Printers folder for the TM before you start the above as you say the existing icon does not work. We hope the above does. Copy the above commands and paste them into a terminal.