SANE - Installing a scanner that isn't auto-detected
+Step 1: Look to see if your scanner is supported
http://www.sane-project.org/sane-mfgs.html

+Step 2: Enable the proper backend
1. Edit the file /etc/sane.d/dll.conf by running the following command:
"gksudo gedit /etc/sane.d/dll.conf"
2. Within that file, change the line that reads:
#example-backend
to read:
example-backend
3. Save the file and close gedit.

+Using sane-find-scanner
With the backend enabled, run the command:
"sane-find-scanner"
the output of that command will look something like this:
found USB scanner (vendor=0x01aa [EXAMPLE], product=0x0001 [EXAMPLE SCANNER]) at libusb:001:003

+Adding the scanner to the backend configuration file
Each sane backend has its own configuration file.
1. We need the results of sane-find-scanner for this next step. You can ignore everything that starts with a hash tag, but the important part is this line:
found USB scanner (vendor=0x01aa [EXAMPLE], product=0x0001 [EXAMPLE SCANNER]) at libusb:001:003

2. We need to add those two values to the back end of our scanner, in this case the example backend. To do that, fire up gedit as root using this command:
"gksudo gedit /etc/sane.d/example.conf"

3. Find the line that reads:
"usb"
and after it we need to add a line with the word "usb" followed by the vendor number and the product number we got with the "scanimage -L" command. That line should look like this:
"usb 0x01aa 0x0001"

4. After you have added that line, save the file and close gedit.
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For my SAMSUNG M2070 running uninstall-scanner.sh and then install-scanner.sh again (with restarting afterwards) fixed the issue. I also installed libsane and sane-utils from the proposed updates repo prior to the above, but not sure if this step is needed.
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FILES

/etc/sane.d/xerox_mfp.conf
    The backend configuration file. By default all scanner types/models are enabled, you may want to comment out unwanted.
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libsane1_1.0.27-100_all_dummy.deb installieren