I was finally able to connect to avasys.jp and downloaded and installed iscan_2.28.1-3.ltdl7_amd64.deb iscan-data_1.13.0-1_all.deb. The programs appeared to install correctly.

I then ran sane-find-scanner and got back:

found USB scanner (vendor=0x04b8, product=0x012d) at libusb:001:003

I then ran lsusb and got back:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 04b8:012d Seiko Epson Corp. Perfection V10/V100 (GT-S600/F650)
Bus 001 Device 004: ID 03f0:4817 Hewlett-Packard 
Bus 002 Device 002: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse

the avasys image scan manual instructed me to run

chmod 0666 /proc/bus/usb/001/003

which returned

chmod: cannot access `/proc/bus/usb/001/003': No such file or directory 

In 12.04, no such directory exists. 12.04 appears to deal with USB in another way.

What must I do to get the usb port 001/003 recognized by xsane and sane as the port where the scanner can be located? What must I do to continue installing the scanner?