Some new information about SANE scanner problem:
Debian (scanner not working):
libsane 1.0.24
libsane-common 1.0.24
Ubuntu (scanner working):
libsane 1.0.23
libsane-common 1.0.23
To experiment, I used synaptic to remove everything related to SANE on Debian Jessie, and then compiled SANE 1.0.23 from source on it. And then command line SCANNING WORKED - Great!
Unfortunately, as soon as I reinstalled either XSane or SimpleScan, synaptic reinstalled SANE 1.0.24 and then nothing worked again.
If these questions sound like I don't know what I'm doing, it's because I don't know what I'm doing (amateur Debian user):
1) Is there some way I can install the older SANE 1.0.23 via Synaptic?
2) Alternatively, since SANE 1.0.22 was part of Wheezy - can that be installed via Synaptic on Jessie?
Hope someone can help!
Original post: https://lists.debian.org/debian-user/2016/03/msg00241.html