made some update from I think 12.04 to 14.04 - now normal users, as well
as saned cannot scan anymore:
florian@Kastl:~$ scanimage -L
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).
florian@Kastl:~$ sudo scanimage -L
[sudo] password for florian:
device `plustek:libusb:003:004' is a Canon CanoScan N650U/N656U flatbed
useradd userdel usermod users users-admin
florian@Kastl:~$ id florian
As you can see I am in groups saned and scanner, and it still does not
work without sudo. Any ideas?