I'm affected as well, my scanner is an Epson GT-S50 (0x04b8 0x0137).
I've documented my observations and trials to resolve on askubuntu.com:
https://askubuntu.com/questions/1034528/epson-gt-s50-scanner-not-
working-after-upgrade-to-18-04-from-16-04
I tried also to do a fresh install of Bionic, but same issue.
I tried to specify my scanner in /etc/sane.d/epkowa.conf (I've added
"usb 0x04b8 0x0137" -without the double quotes- in the appropriate
section of the file) and added the following UDEV rules in a
55-libsane.rules file under /etc/udev/rules.d/
> SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", MODE=="0666"
SUBSYSTEM=="usb_device", MODE=="0666"
ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="0137", MODE="0666",
GROUP="scanner", ENV{libsane_matched}="yes"
So far, no luck, scanner remains stubbornly undetected :'(
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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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