Please use the workaround for Epson Iscan, Brother brscan,brscan2 and brscan3 Scanners from here
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1728012/comments/36
brscan4 no luck until now
Please use the workaround for Epson Iscan, Brother brscan,brscan2 and brscan3 Scanners from here
https:/ /bugs.launchpad .net/ubuntu/ +source/ sane-backends/ +bug/1728012/ comments/ 36
brscan4 no luck until now