This is getting strange. Running sane-find-scanner (as either root or user) produces :--
found USB scanner (vendor=0x04b8 [EPSON], product=0x0118 [EPSON Scanner]) at libusb:001:003
# Your USB scanner was (probably) detected. It may or may not be supported by
# SANE. Try scanimage -L and read the backend's manpage.
so I tried scanimage -L which produced :-
No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
I cannot understand why the scanner is detected in some software & not others. Are there drivers or kernel modules which should be installed ? I was under the impression that SANE was supposed to give basic functions for most available scanners, I appreciate that specialised drivers and/or software will be required to access the more advanced features of the scanner.