Tuto:Canon 120 LiDE scanner
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
then (assuming the user has the sane and all sane libraries installed) do a full-upgrade by
sudo apt full-upgrade
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
Now your scanner should work with any frontends like simple-scan or gscan2pdf.