I've recently had the same problem of vertical black stripes on scans from my Canon imageCLASS MF244DW under Ubuntu 18.04.1. Compiling and installing sane-backends from https://github.com/kkaempf/sane-backends solved the problem.
I've recently had the same problem of vertical black stripes on scans from my Canon imageCLASS MF244DW under Ubuntu 18.04.1. Compiling and installing sane-backends from https:/ /github. com/kkaempf/ sane-backends solved the problem.