[sane-devel] [Solved] Remote scanners stopped working after upgrade to Ubuntu 16.04

[Daniel Dickinson]

Please not below; you don't need to edit files for saned to work with 16.04.

On 16-05-01 01:45 PM, m. allan noah wrote:
> Thanks for the info. I'm not sure how much of this configuration comes
> with sane-backends, and how much is provided by the distro. Perhaps
> you could also ask the distro about it?
> 
> allan
> 
> On Sun, May 1, 2016 at 12:59 PM, Jörn-Ingo Weigert <jiweigert at gmail.com> wrote:
>> Info for all who are affected that saned stopped working after upgrade to
>> Ubuntu 16.04 with using systemd (which is default in Ubuntu 16.04)
>>
>> The problem is that saned stopped working after upgrade, cause the
>> saned.service is indicated as "marked" when you try to start it via:
>>
>> `sudo service saned start´ or `systemctl start saned.service´.
>>
>> The solution was to modify the related systemd files as the
>> delivered/generated files in the sane-utils package did not the job right.

Actually incorrect.  The correct thing to do is

systemctl enable saned.socket

That's it.  Socket is not enabled by default per security policy.

Regards,

Daniel

>>
>> 1. Check that the RUN option in file /etc/default/saned is set to RUN=no (As
>> we dont use systemd AND NOT SysV Init!!)
>>
>> 2. I deleted the file /lib/systemd/system/saned.service as it was linked to
>> /dev/null (why?)
>>
>> 3. The file /lib/systemd/system/saned.socket should have this (unmodified)
>> content:
>>
>> [Unit]
>> Description=saned incoming socket
>>
>> [Socket]
>> ListenStream=6566
>> Accept=yes
>> MaxConnections=1
>>
>> [Install]
>> WantedBy=sockets.target
>>
>> 4. The content of the file /lib/systemd/system/saned at .service should be
>> changed to:
>>
>> [Unit]
>> Description=Scanner Service
>> Requires=saned.socket
>>
>> [Service]
>> ExecStart=/usr/sbin/saned
>> User=saned
>> Group=saned
>> StandardInput=null
>> StandardOutput=syslog
>> StandardError=syslog
>> Environment=SANE_CONFIG_DIR=/etc/sane.d
>> # Environment=SANE_CONFIG_DIR=/etc/sane.d SANE_DEBUG_DLL=255
>>
>> [Install]
>> Also=saned.socket
>>
>> Where "StandardInput" should be set to "StandardInput=null"
>>
>> 5. To start saned on bootup use the command:
>>
>> `systemctl enable saned at .service´
>>
>> 6. Check in /etc/sane.d/net.conf if "connect_timeout=60" is not commented
>> out and localhost / your servers ipadress is listed to check via
>> [simple-scan | xsane | scanimage -L] on the server, that the scanner is
>> available after a REBOOT.
>>
>> 7. Check if your client-ipadresses / -FQDN are listed in
>> /etc/sane.d/saned.conf otherwise they are not allowed to connect!
>>
>> 8. Check if the appropriate backend is enabled in /etc/sane.d/dll.conf for
>> your scanner-model
>>
>> 9. Follow the hints about the permissions you may have to set to the
>> usb-device / inside the udev-file: /lib/udev/rules.d/40-libsane.rules .
>>
>> 10. If you can scan successfully local on your server / pc  with one of the
>> scanner frontends then press your thumbs and reboot your server / pc
>>
>> 11. After reboot, `scanimage -L´ should list the USB-device
>> (usb:usbport:xxx) and the provided network device
>> (net:<ip>:<device_serial_number>) for your scanner
>>
>> Check with `systemctl status saned.socket´ and `systemctl status
>> saned at .service´ if both are active/ready.
>>
>>
>> Now you should be able to scan remotly again
>>
>> Hope this little advises help someone.
>>
>> Ingo Weigert
>>
>> --
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> 
> 
>