I forgot to mention that also needed is something like
/etc/udev/rules.d/59-local.rules.
In my upgraded installation it has not changed since 16.04 and looks like this:
---------------
# Brother MFC-J220
ATTRS{idVendor}=="04f9", ATTRS{idProduct}=="0259", MODE="0664",
GROUP="scanner", ENV{libsane_matched}="yes"
---------------
Of course 'idProduct' has to match the local scanner model, 'lsusb' and
'sane-find-scanner' are your friends.
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https://bugs.launchpad.net/bugs/1728012
Title:
Many 3rd party scanner drivers are broken by a sane change
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