Brother DCP J125 Printer driver on ubuntu linux is hard configure, and I done it by this method.

Firstly, install all brother driver in your synaptic. Search for 'brother printer' and install all by check all box.

Second, after installed, close your synaptic and open terminal, use this:

sudo aa-complain cupsd

sudo mkdir /usr/share/cups/model

sudo apt-get install sane-utils

sudo apt-get install tcsh

sudo dpkg -l | grep Brother

lsusb

Now we want to edit some file... change or add the line by 3 step

1. sudo gedit /etc/udev/rules.d/45-libsane.rules

add this line:

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

# Brother DCP-J125
SYSFS{idVendor}=="04f9", SYSFS{0253}=="0253", MODE="664", GROUP="scanner"

2. sudo gedit /etc/udev/rules.d/40-basic-permissions.rules

add this line:

SYSFS{idVendor}=="413c", SYSFS{idProduct}=="5105", MODE="664", GROUP="scanner"
# Dell A960
SYSFS{idVendor}=="413c", SYSFS{idProduct}=="5107", MODE="664", GROUP="scanner"
# Dell 922
SYSFS{idVendor}=="413c", SYSFS{idProduct}=="5109", MODE="664", GROUP="scanner"
# Dell 1600n
SYSFS{idVendor}=="413c", SYSFS{idProduct}=="5250", MODE="664", GROUP="scanner"
# Brother DCP-115C
SYSFS{idVendor}=="04f9", SYSFS{idProduct}=="018c", MODE="664", GROUP="scanner"
# Brother DCP-J115
SYSFS{idVendor}=="04f9", SYSFS{idProduct}=="0253", MODE="664", GROUP="scanner"

LABEL="libsane_rules_end"

3. sudo gedit /lib/udev/rules.d/50-udev-default.rules

Edit this entry:
Code:
# libusb device nodes
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0664"
into:
Code:
# libusb device nodes
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0666"

Open http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/download_scn.html and download:
Scanner driver for brscan3 models
1. brscan3
2. brscan-skey

open http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/download_prn.html#DCP-J125
and download:
lpr-driver
cupswrapper driver

check your driver again:

dpkg -l | grep Brother

it must look like this:

ii brother-cups-wrapper-common 1.0.0-10-0ubuntu5 Common files for Brother cups wrapper packages
ii brscan-skey 0.2.1-3 Brother Linux scanner S-KEY tool
ii brscan3 0.2.11-4 Brother Scanner Driver
ii dcpj125cupswrapper 1.1.1-1 Brother CUPS Inkjet Printer Definitions
ii dcpj125lpr 1.1.1-1 Brother lpr Inkjet Printer Definitions

Restart your pc.............

To get the scan-key-tool to start automatically at Ubuntu boot by default.

Install: sane-utils (if not already installed , it's in Synaptic Package Manager)

Add the brscan-skey command to your startup program.

System -> Preference -> Sessions -> Startup Programs -> New

Enter "brscan-skey" in:
Name: and
Command:
Comment: Enter what you want to call your Scanner

Press OK and enable the entry.

Good luck