Canon Pixma G3501 at *Ubuntu 18.04 LTS: help needed to get the scanner running.

[Brian]

On Sun 13 Sep 2020 at 15:56:59 +0200, Bas G. Roufs wrote:

> Hello Brian,
> 
> Before carrying out the tests you suggest in your latest mail, I first
> explain what I have done in the mean time.
> 
> I did install the exactly right print and scan drivers from Canon.....
> 
> https://ijstartcanon.net/canon-pixma-g3501-drivers-download/
> 
> I did so more or less along the lines of this tutorial....
> 
> https://tutorialforlinux.com/2019/04/08/how-to-install-canon-g3500-g3501-driver-on-ubuntu-18-04-bionic-lts/2/

What many users do not appreciate is that Canon do not supply drivers
to use with SANE, so SANE hasn't anything to work with. See

  https://wiki.debian.org/Scanner#canon

'scanimage -L' gives you

  device `pixma:G3000_192.168.2.12' is a CANON Canon PIXMA G4000 Series

This is sane-pixma, provided by the SANE project, not Canon. It is
telling you it has found a device to use. The device doesn't work, but
that is a different matter.

> Now, let's carry out a few tests.....

Ok as far as it goes, but the only hostname is Viaconsensus-iter.local
and there is no hostname or IP address for the printer device. I will
return to this later.

[Snip]

> Now, I carry on with the scan test:
> 
> bas at Viaconsensus-iter:~$ avahi-browse -rt _uscan._tcp
> bas at Viaconsensus-iter:~$
> 
> Still no result, though I DID install also the scan software directly from
> Canon.

_uscan._tcp is a service provided by the MFD and nothing to do with the
installed Canon packages. Maybe the MFD doesn't have a _uscan._tcp
service to offer, but we haven't enough information from the avahi-browse
outputs to make a judgement.

> Now, another test. I try to scan something. I launch XSane from terminal.
> The program starts and the device is being discovered instantly. I hit at
> the scan button. Then, I hear the device reacting - so the wireless
> connection is there, cause I did not connect it via the USB cable. Also
> during the installation process, I have indicated that I want to use a
> wireless connection. However, still no result. I get again this graphical
> error report:
> 
> "(....)
> 
> Error during read. Error during device I/O.

The pixma backend is not behaving itself properly. I do not have the
skills to debug this and, in any case, have an easier potential solution.

[Snip]

> Skanlite delivers a similar non-result :-).
> 
> OK, now I carry on with the tests in your latest message.
> 
> On 13-09-2020 14:46, Brian wrote:
> > On Sun 13 Sep 2020 at 12:01:49 +0200, Bas G. Roufs wrote:
> > 
> > > OK, I have disconnected the USB cable at both sides. Interesting. I get
> > > exactly the same result:
> > > 
> > > bas at Viaconsensus-iter:~$ scanimage -L
> > > device `pixma:G3000_192.168.2.12' is a CANON Canon PIXMA G4000 Series
> > > multi-function peripheral
> > > bas at Viaconsensus-iter:~$
> > Lets continue checking that the 3501 is reachable.
> > 
> > What do you get with 'ping -c 3 192.168.2.12'?
> 
> bas at Viaconsensus-iter:~$ ping -c 3 192.168.2.12
> PING 192.168.2.12 (192.168.2.12) 56(84) bytes of data.
> 64 bytes from 192.168.2.12: icmp_seq=1 ttl=64 time=18.8 ms
> 64 bytes from 192.168.2.12: icmp_seq=2 ttl=64 time=7.57 ms
> 64 bytes from 192.168.2.12: icmp_seq=3 ttl=64 time=11.8 ms
> 
> --- 192.168.2.12 ping statistics ---
> 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
> rtt min/avg/max/mdev = 7.577/12.734/18.808/4.630 ms
> bas at Viaconsensus-iter:~$
> 
> > Can you access the 3501's
> > web interface with http://192.168.2.12 in the address bar of a browser?
> 
> Yes, I can - see attachment with a small version of the page I see there.
> It's a page dedicated to the "Printer status" of my device. It tells also
> that the printer is "in operation". Additionally, there are instructions
> about the ink tank, etc.

I think we can now be confident the MFD is network connected. You have
also discovered the MFD's administration page. While you there would you
look for settings involving "Bonjour"; it's probably under network or
lan.

If it is not enabled, please enable it and rerun both avahi-browse
commands. You are looking for any sign of the 3501.

> > Let's see what we get from what I have asked for. I do have some
> > alternative software in mind, Bas.
> 
> Good. Tonight, after 22.30 time in NL/ 21.30 time in Britain, I will check
> your suggestions till that moment and get back to you. Friends are waiting
> for me now.

Download and install sane-airscan from

  https://github.com/alexpevzner/sane-airscan

A direct link to the file you want is

  https://download.opensuse.org/repositories/home:/pzz/xUbuntu_18.04/amd64/

100% of the users to whom I have recomended this backend have had great
success with it. I would be very interested in what 'scanimage -L' gives
you.

Regards,

Brian.