Epson offers what appears to be the print drivers, including wireless connect,for the wf-3640 printer. (got it on sale from tigerrdirect.com retail shutdown) Although all but iscan install saying it need epkowa commponent. I must admit I am lost. I am convinced this printer can be setup to work with Ubuntu but I am at the point I need some help/guidance on what to do???? Even after installing all but iscan there is not printer that appears to be installed.
This is very late, but for anyone else searching for the driver, it is in the package printer-driver-escpr which can be installed via apt-get or any of the graphical package managers (but not the software center).
As far as I know, epkowa is the proprietary scanner driver by Epson. If it says you need the epkowa component (i.e. sane-epkowa back-end), that likely means you need to follow the below guides: How to install printer component/driver: http://tutorialforlinux.com/2014/08/23/how-to-install-epson-wf-3640-all-in-one-printer-drivers-quick-start-scanning-on-ubuntu-14-04-trusty-linux-easy-guide/ How to install scanner component/driver: http://tutorialforlinux.com/2014/08/23/quick-start-with-epson-scanner-for-ubuntu-14-04-trusty-lts-with-iscan-easy-guide/ Hope I was helpful :-)
sudo apt-get install printer-driver-escpr
worked like a charm for me on Ubuntu Xenial 16.04.
A very late addition - hopefully somebody will benefit from this.
Above procedure (sudo apt-get install printer-driver-escpr, then add a printer in GUI) will result in a working printer, however it will not report ink levels, as it seems to create an IPP printer.
If you create a 2nd driver based on URI, enter "dnssd://EPSON%20WF-3640%20Series._ipp._tcp.local/" this will have the same functionality PLUS be able to report ink levels.
Came up with a driver for a Epson 3540 instead of a 3640 which is what I wanted, but it worked fine for what I needed to print. Thank you.