Comment 129 for bug 1728012

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 :'(