I've installed all drivers for Epson 730 combo printer scanner and followed NastyRecord's excellent instructions for setting everything up, but ...

Sane sees the scanner, but returns the following error when I try to use it.

Failed to open device
epkowa:usb:008
Access has been denied

Ubuntu 12.04.1lts

Vendor = 0x04b8
Product = 0x087B
libusb:001:008

Suggestions?