Just bought a 'Canoscan Lide 120' scanner that I plan to use on a windows 7 laptop. In Ubuntu 14.04 64-bit it is detected by 'sane-find-scanner' but with 'Simple Scan' I just get: "No scanners detected". Any hope???
Now the canon LiDE 120 runs on Ubuntu 14.04 and even tested in 16.04 as well, for this you have to do the following:
To add the SANE PPA so that you have the latest version of SANE (backport), open your terminal and type
$ sudo add-apt-repository ppa:rolfbensch/sane-git
$ sudo apt update
$ sudo apt full-upgrade
Or if you do not have sane and all its libraries installed then install it by executing the following.
$ sudo apt -y install sane libsane libsane-common sane-utils libsane-extras
you can also use synaptic package manager to check and make sure that sane is up-to-date with all necessary libraries.
Now your scanner should work with any frontends like simple-scan or gscan2pdf.
or you can compile
sane-backend from the latest source, that will also do the job, in that case you have to have
libusb-dev build-essential libsane-dev and for avahi network support
libavahi-client-dev libavahi-glib-dev installed on your system. To do the compiling, you can follow https://help.ubuntu.com/community/CompileSaneFromSource
and it will help you some more https://help.ubuntu.com/community/sane