Comment 58 for bug 83587

Polo:

For me, the following command:
sudo echo -e "libsane hold" | dpkg --set-selections
has succeeded in putting the libsane package in "hold" status, so update-notifier does not bother me any more asking me to upgrade it.
I just have to be careful when I update other packages via update-manager that libsane, still appearing in the list, is not marked and so, it is not unintendedly upgraded.

You can check whether libsane is or is not in hold status by the comand
dpkg -l libsane
The first letter in the last line of the reply should be an "h" if the package is in fact in hold status (an "i" if it is not).