I have just installed my Epson sx125 on a 12.04 based system and i got the driver from Epsons site
http://download.ebz.epson.net/dsc/search/01/search/searchModule (I can see in the list that you will need the same driver as I use for mine exempt mine don't have use for the wi-fi-driver.)
There are several packages to download and they have to be installed in the right order, but if you do it with the Gdebi-packageinstaller it will inform you if you have missing dependencies and if your aren't installing in the right order.
I thought it was quite easy
- at least in comparison with installing my Brother MFC-J6510DW