ADDENDUM to #129: Ah! Success!
I followed the advice of comment #28
(https://bugs.launchpad.net/ubuntu/+source/sane-
backends/+bug/1728012/comments/28), and it works !!!
Did the following:
$ sudo ln -sfr /usr/lib/sane/libsane-epkowa* /usr/lib/x86_64-linux-gnu/sane
Then:
1. Removed the "usb 0x04b8 0x0137" entry I had added to /etc/sane.d/epkowa.conf
2. Added a 55-epson-libsane.rules file to /etc/udev/rules.d/ with the following
text:
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", MODE=="0666"
SUBSYSTEM=="usb_device", MODE=="0666"
ATTRS{manufacturer}=="EPSON", DRIVERS=="usb", SUBSYSTEMS=="usb",
ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="*", MODE="0666"
ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="0137", MODE="0666",
GROUP="scanner", ENV{libsane_matched}="yes"
Finally I unplugged / plugged my scanner and tried:
$ scanimage -L
And got this encouraging answer:
device `epkowa:interpreter:003:011' is a Epson GT-S50 flatbed scanner
Then I started iscan (Image Scan!) and it immediately detected my scanner.
I then could successfully scan a page.
The workaround is thus effective! Thanks to all contributions :-)
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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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