As per allend's comments, try installing the following...
Code:
sudo apt-get install lib32z1 lib32ncurses5 lib32stdc++6
I'm not sure if this needs to be done prior to the Brother driver installation, or it can be done post-install, but give it a shot and report back.
Similar described here...
https://darrengoossens.wordpress.com...x-32-bit-libs/