Comment 4 for bug 67659

Temporary fix:
Grab dapper libsane from:
http://www.mirror.ac.uk/mirror/archive.ubuntu.com/ubuntu/pool/main/s/sane-backends/libsane_1.0.17-1ubuntu4_i386.deb
then as root
dpkg -i sane-backends/libsane_1.0.17-1ubuntu4_i386.deb

Then to prevent the package changing, do
aptitude hold libsane