first things first. I think it is time to move on to a later version of
Ubuntu. 12.10 is out and that makes 2 years. Why go to all the trouble
when 10.10 has limited life. The later version may well have support for
the printer, don't know that for sure but it might.

Synaptics package manager has an Icon and can be run from the desktops
window interface. start the dash and type in Synaptics and it should
show up before you are through typing. Very little need to learn how to
use it, it is self intuitive.

I don't much use RPM files. when I have tried I have failed. Mostly
though converting so I can use something that has no deb has to be an
unbelievable product, something I have not seen to much of.

I was able to make a Kodak printer scanner work for someone just by
googling instructions on how to do it, so would suggest you try that,
for your printer. Also in your search remember to use the "ubuntu" key word.