Server 20.04 - sane is not responding - SOLVED!

[David Fletcher]

On Fri, 2020-05-22 at 18:36 +0100, David Fletcher wrote:
> Hi all,
> 
> I recently upgraded my home server from the 32 bit board that's been
> running for the last 10 years to a 64 bit industrial mini ITX board.
> 
> Until then I was running 14.04 with which everything was working
> perfectly including networked scanning. Uptime when I switched it off
> was 332 days. All I needed to do was put the local network address
> into
> saned.conf and it "Just Worked".
> 
> Now, sane just won't work. I start xsane on the desktop computer, it
> puts up the message box that it's searching for scanners for a few
> seconds then gives up and says it can't find any.
> 
> Now, I've seen a lot of vitriol spoken about systemd but this is the
> first time I've met it. Apparently it is the source of my sane
> problem
> but I have no idea how to fix it. Google searching produced some hits
> from a couple of years ago so it was a problem then and for me is a
> problem now.
> 
> Can I please get a little advice, preferably simple, to get sane
> listening to my network again?

That took a while but I've had other things to worry about! An
obviously better Google search string led me to here:-
https://unix.stackexchange.com/questions/548579/sane-cant-find-my-scann
er-permission-problem-even-if-i-added-udev-rules-unle

When I used
sudo sane-find-scanner
I got (relevant lines only)
found USB scanner (vendor=0x04b8 [EPSON], product=0x0112 [EPSON
Scanner]) at libusb:001:123
found USB scanner (vendor=0x1a86, product=0x7523 [USB2.0-Serial]) at
libusb:001:002

so the solution was
sudo joe /lib/udev/rules.d/10-local.rules

putting in the single line
ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="0112", MODE="0666"
substituting my vendor and product IDs for the Canon ones on the
StackExchange solution.

To activate, simply switch the scanner off and on again.

There's a letter with some travel vouchers that I needed to scan to a
pdf file so I fired up gscan2pdf on my desktop computer, sane on the
server responded and worked perfectly as before.

Hope this helps others and works permanently.

Dave