To install the driver on the x64 architecture you should go to Brother's driver download page: http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/download_prn.html and download the .deb packages corresponding to your printer model. Then to install these packages:
sudo apt-get install ia32-libs sudo dpkg -i --force-all hl2270dwlpr-2.1.0-1.i386.deb cupswrapperHL2270DW-2.0.4-2.i386.deb
sudo dpkg -l | grep Brother
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