See Here Step 5
Originally Posted by ceaxer
From a terminal Applications > Accessories > Terminal
will show if the driver has been installed.It should be the brscan3 driver.
dpkg -l | grep Brother
Then again from the terminal
The name "Scanner" can be anything you want.You have to find out the IP address of the printer by looking on the router.
brsaneconfig3 -a name=Scanner model=MFC-6490CW ip=xx.xx.xx.xx
To see if it is correct
or whatever you called it.
brsaneconfig3 -q | grep Scanner