I don't want to get your hopes up, but I've dug up an Ubuntu thread, which suggests that the Konica Minilta Magicolor 1600w driver may be okay to use:
Ref posts #7, #8
It will depend on the Ubuntu version you're using though. Strangely I can't see any references to such a driver on CUPS or gutenprint websites, so good luck with this.
To digress a bit, I note that the Epson Aculaser C1700 is a GDI printer, which depend heavily on the manufacturer for driver support for the reasons outlined here:
http://www.openprinting.org/printer/Gen ... DI_Printer
"GDI" means "Graphical Device Interface" and is a software API created by Microsoft through which applications communicate with the drivers of graphical output devices, as printers or graphics cards. "GDI" is not a hardware protocol, the hardware protocols of GDI printers can be completely different, even between models of the same manufacturer. For Windows users this is no problem, as every printer comes with a driver CD containing a driver exactly for the particular printer.