apt-get install xsltproc

dpkg -i iscan-data_1.22.0-1_all.deb
dpkg -i iscan_2.29.1-5~usb0.1.ltdl7_amd64.deb
dpkg -i esci-interpreter-gt-f720_0.1.1-2_amd64.deb

vi /etc/sane.d/dll.conf

...
dell1600n_net
dmc
epjitsu
#epson
#epson2
fujitsu
#gphoto2
...

Benutzer der Gruppe Scanner zuweisen.