you are using Mint 13 ? and you are using 32bit or 64bit?
I see brother advise issuing two commands before you start the download: I enclose them below in quotes: if you copy and paste
sudo aa-complain cupsd
and
sudo mkdir /usr/share/cups/model
............this may well already exist............
If you go here
http://welcome.solutions.brother.com/bs ... index.htmland select the top box, it is called Download
that gets you to here
http://welcome.solutions.brother.com/bs ... d_scn.html(
If you use the Edit..Find function on your browser, you find that the DCP-7040 is a brscan3 model)
....
so you need brscan3 ........and Mint is derived from ubuntu so uses debian packages so you need those ending in .deb
.......and choose the 32bit or 64bit as appropriate.................click to download the brscan3 deb package (32bit or 64bit); if gdebi installer jumps in and offers to install, let it ..
from this same page, select and download and install the appropriate scan-key tool (ie .deb package and appropriate 32bit or 64bit .......)
if you then issue the command
sudo dpkg -l | grep Brother
...........that just looks to see the scanner driver and scan-key-tool is installed.........
________________________________________________________________________________________________________________________
TO USE YOUR SCANNER.....Brother say you must edit a file........
here is what they say to dosudo gedit /lib/udev/rules.d/40-libsane.rules
then ...add the following two lines to the end of the device list (ie copy and paste the two lines below in the file that was opened by gedit, which is a text editor..............
# Brother scanners
ATTRS{idVendor}=="04f9", ENV{libsane_matched}="yes"
............they say :
(paste these two lines in
Before the line "
# The following rule will disable ..."):
If there is
"LABEL="libsane_rules_end"",
add the 2 lines before "LABEL="libsane_rules_end"".
...............opening up my /lib/udev/rules.d/40-libsane.rules file with gedit, I have the LABEL="libsane_rules_end at the very end of the file; so scroll to the very end of the file and likely you will have the same; paste the two lines in just above
Phew!
that is my attempt to understand Brother's instructions and get your scanner going for you; most folks seem very pleased with them once operational...........