After some work and researching the Internet, I've been able to get the dual monitors working on the UbuntuLinux with my old ATI 8500 LE dual video display card which displays 1280x1024 great on dual monitors on my two Dell FP1901 19" monitors!
I also have been able to get dual monitors working with nVidia GT7600 card (great video card!) running the same DELL FP1901 19" monitors in 1280x1024. I had to use the proprietary nvidia driver to get it to work properly on the nVidia GT7600 card.