Ubuntu
sane-backends package

  1. Bug #1741977
  2. Comment #6

Comment 6 for bug 1741977

Revision history for this message
Mantas Kriaučiūnas (mantas) wrote : Re: Samsung SCX-3200, SCX-3400, CLX-6260 scanning fails after upgrading to Ubuntu 17.10/18.04

It seems the best solution for now is to add SANE_USB_WORKAROUND=1 line to /etc/environment:

echo "SANE_USB_WORKAROUND=1" | sudo tee -a /etc/environment

(or to /etc/systemd/user.conf: echo "DefaultEnvironment=SANE_USB_WORKAROUND=1"|sudo tee -a /etc/systemd/user.conf )

For more info why SANE_USB_WORKAROUND=1 is needed look at http://www.sane-project.org release notes of 1.0.27:
Note 3: The Linux USB3 workaround which was added in version 1.0.25 is now disabled by default. If you have difficulty using a scanner which previously worked, or intermittent scanner availability, try setting the new environment variable SANE_USB_WORKAROUND=1 before starting frontend.
I found this info in comments of bug #1728012 and https://askubuntu.com/questions/966834/ubuntu-17-10-and-samsung-scx-4624f-scanner-not-working/966835