Comment 5 for bug 578620

I had the same problem with my Brother DCP-145C on Ubuntu 10.04 when I upgraded and I just found a SOLUTION.

The post referred to by robbychen (http://blog.robbychen.com/2010/03/25/brother-scanner-driver-installation-in-ubuntu/) almost works, but the lines of coded needed to be added are slightly different, and I found the solution at http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/instruction_scn1c.html#u9.10

SOLUTION for Ubuntu 10.04 (despite it referring to 9.10 with the same solution) is the following (taken from the page I just linked to):
"
    1. Open "/lib/udev/rules.d/40-libsane.rules" file.
    2.Add the following two lines to the end of the device list. (Before the line "# The following rule will disable ..."):

    The lines to be added---------------------------

    # Brother scanners
    ATTRS{idVendor}=="04f9", ENV{libsane_matched}="yes"

    3. Restart the OS. "

Hope this helps.