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I am having difficulty installing driver for my mfc-7420 scanner. I got the printer portion right. But I think I may have got wrong driver downloaded for scanner. Now I think I have right one but won't let me install. Help!

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The required package needs to be installed "sane-utils"

sudo apt-get install sane-utils

Next download the correct version of the Linux Driver from:

Brother Scanner Drivers

for USB installation follow these instructions HERE

Settings for normal users:

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. 

all instructions found HERE

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