FYI, @ramas (slocascio), fermulator (fermulator) and Alec B (castegere)
instructions - slightly updated and automated for Ubuntu 18.04.1
(libsane1_1.0.27-1~experimental3).

Also, I expanded the patch to test for both "slow_back_home" and
"rewind", just in case it matters for some hardware.

--- cut here ---

# in Synaptic, Ubuntu Settings >> Repositories, enable "Source code"
apt-get source libsane1

# eyeball first
patch sane-backends-1.0.27/backend/genesys.c --dry-run < genesys.c.diff

# if the above was successful
patch sane-backends-1.0.27/backend/genesys.c < genesys.c.diff

sudo apt-get build-dep libsane1
cd sane-backends-1.0.27
./configure
sudo apt-get install fakeroot
dpkg-buildpackage -rfakeroot -uc -b
cd ..

sudo rm /usr/share/doc/libsane1/changelog.Debian.gz
sudo dpkg -i libsane1_1.0.27-1~experimental3ubuntu2_amd64.deb
# reboot

--- cut here ---


** Patch added: "genesys.c.diff"
   
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1731459/+attachment/5197760/+files/genesys.c.diff

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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1731459

Title:
  genesys_gl847 scanners produce a black band in scanned images on
  Ubuntu 17.10+ (and 18.04 LTS)

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https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1731459/+subscriptions

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