It seems at the time of writing there is a problem with detecting some Epson printers on the new Ubuntu.
I found the best way to do it is to download the .deb file from the link below and install the driver using any one of Ubuntu’s installers. Then when you try and detect the printer it won’t go online searching for the driver it will already have it and all will be good.
http://download.ebz.epson.net/dsc/search/01/search/?OSC=LX
It looked to me like there was a problem in converting an rpm version of the driver to .deb format. I’m not sure why the automatic programs try and do this though as Epson release .deb drivers!