tl;dr:
Save
A1fw.usb to /usr/share/sane/gt68xx/ and start scanning with sane.
More general instructions for installing a scanner:- Your user should be in group "scanner" and sane must be installed. In my case I have:
Code:
ii libsane:amd64 1.0.24-13 amd64 API library for scanners
ii libsane-common 1.0.24-13 all API library for scanners -- documentation and support files
ii libsane-extras:amd64 1.0.22.3 amd64
...
