I am running 12.04 (Precise). On my machine, the problem turned out to
be that the saned user was not part of the scanner group. So the simple
solution for me was to add the saned user to the scanner group with the
command:
sudo adduser saned scanner
Diagnosing the problem was made difficult by the fact that the group of
the device file is root. On my machine, sane-find-scanner reveals that
my scanner is at libusb:003:002. There is no "normal" indication that
the scanner group can read the device:
$ ls -l /dev/bus/usb/003/002
crw-rw-r--+ 1 root root 189, 257 Oct 13 09:02 /dev/bus/usb/003/002
You must use the getfacl command to determine that the scanner group has
read permission:
$ getfacl /dev/bus/usb/003/002
getfacl: Removing leading '/' from absolute path names
# file: dev/bus/usb/003/002
# owner: root
# group: root
user::rw-
user:tom:rw-
group::rw-
group:scanner:rw-
mask::rw-
other::r--
We can see that the scanner group was granted read permission via
setfacl:
$ grep setfacl /lib/udev/rules.d/40-libsane.rules
ENV{libsane_matched}=="yes", RUN+="/bin/setfacl -m g:scanner:rw $env{DEVNAME}"
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https://bugs.launchpad.net/bugs/773617
Title:
Saned group is missing permissions to access scanners via udev-acl
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/773617/+subscriptions
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