First, I went to the Brother site and downloaded the driver and key. welcome.solutions.brother.com
I installed the driver and key by clicking on them and installing via the Ubuntu Software Center. The Center informed me that the files were of poor quality. I informed the Center to proceed as directed and not give me any backtalk.
Second, I added the scanner to libsane.rules using the terminal to get root access to the editor:
sudo gedit '/lib/udev/rules.d/40-libsane.rules'
Then I inserted language before the following line in that file:
"# The following rule will disable USB autosuspend for the device"
Here is the language to add:
# Brother scanners
ATTRS{idVendor}=="04f9", ENV{libsane_matched}="yes"
Third, I saved the file, closed the editor, closed the terminal, rebooted.
How to fix this ?