Why isn't saned working?

Question

linux

On the
Ubuntu 16.04
server I connected the scanner to the usb port to the server. Installed apt-get install sane sane-utils
/etc/default/saned on the server

# Defaults for the saned initscript, from sane-utils

# Set to yes to start saned
RUN=yes

# Set to the user saned should run as
RUN_AS_USER=saned

/etc/sane.d/saned.conf:

# saned.conf
# Configuration for the saned daemon

## Daemon options
# Port range for the data connection. Choose a range inside [1024 - 65535].
# Avoid specifying too large a range, for performance reasons.
#
# ONLY use this if your saned server is sitting behind a firewall. If your
# firewall is a Linux machine, we strongly recommend using the
# Netfilter nf_conntrack_sane connection tracking module instead.
#
# data_portrange = 10000 - 10100


## Access list
# A list of host names, IP addresses or IP subnets (CIDR notation) that
# are permitted to use local SANE devices. IPv6 addresses must be enclosed
# in brackets, and should always be specified in their compressed form.
#
# The hostname matching is not case-sensitive.
192.168.1.0/24

#scan-client.somedomain.firm
#192.168.0.1
#192.168.0.1/29
#[2001:db8:185e::42:12]
#[2001:db8:185e::42:12]/64

# NOTE: /etc/inetd.conf (or /etc/xinetd.conf) and
# /etc/services must also be properly configured to start
# the saned daemon as documented in saned(8), services(4)
# and inetd.conf(4) (or xinetd.conf(5)).

service saned restart
service saned status:
saned is running.
scanimage -L

device `hpaio:/usb/Deskjet_2520_series?serial=CN4872J1MV05VD' is a Hewlett-Packard Deskjet_2520_series all-in-one

scanimage > file - works
Client:
Ubuntu 14.04
apt-get install sane sane-utils
/etc/default/saned

# Defaults for the saned initscript, from sane-utils

# Set to yes to start saned
RUN=yes

# Set to the user saned should run as
RUN_AS_USER=saned

/etc/sane.d/net.conf

# This is the net backend config file.

## net backend options
# Timeout for the initial connection to saned. This will prevent the backend
# from blocking for several minutes trying to connect to an unresponsive
# saned host (network outage, host down, ...). Value in seconds.
connect_timeout = 60

## saned hosts
# Each line names a host to attach to.
# If you list "localhost" then your backends can be accessed either
# directly or through the net backend.  Going through the net backend
# may be necessary to access devices that need special privileges.
# localhost
192.168.1.233

service saned restart
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).

Actually for some reason clients do not see the scanner. Why?

Answer 1

Most likely, the necessary firmware is missing, which should be cursing in /var/log/syslog. We look in the log, find the name of the firmware file, look for it in apt, if we don’t find it on 14.04, we google the file / deb-package on the Internet.