Hi Staedtler, bingo it is. I did try what You suggest, no joy, but the
information that You collected (and that I couldn't even imagine of),
have put me on the right track. Here's what works for me:

1) I created a /etc/udev/hwdb.d/brother4.hwdb file with the lines

usb:v04F9p035D*
 libsane_matched=yes

where the file is named after the backend, v049f is vendor ID, and p035d
is product ID; those may very well change for other scanners :-)

2) edited the file /etc/sane.d/dll.d/libsane-extras and added the line

brother4

this may very well change for other backends :-))

no need for the brother-udev-rule-type1 package, nor for Your clever
hack, which has been a good catch anyway. I did not investigate on
permissions, but I may! HTH with other scanners too. Thanks for engaging
into this all. Regards, Luca

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to sane-backends in Ubuntu.
https://bugs.launchpad.net/bugs/1728012

Title:
  Many 3rd party scanner drivers are broken by a sane change

Status in sane-backends package in Ubuntu:
  Confirmed

Bug description:
  Many scanners can no more be used since sane has changed something:
  The 3rd-party plug-in the vendor provides as .deb package will still
  install. But the scanner is no more recognized.

  Scanners that are affected are(besides others):
   - Epson Perfection V10
   - Epson Perfection V1000
   - Epson WorkForce GT-1500
   - Brother MFC-8510DN
   - Epson Perfection V33

  It is to note that the probability that the scanner manufacturers fix
  things others broke is below 100%.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: libsane1 1.0.27-1~experimental2ubuntu2
  Uname: Linux 4.14.0-041400rc5-lowlatency x86_64
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  Date: Fri Oct 27 12:35:52 2017
  EcryptfsInUse: Yes
  SourcePackage: sane-backends
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1728012/+subscriptions

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