Install brother-cups-wrapper-ac by entering the following commands in the terminal:
sudo apt update sudo apt install brother-cups-wrapper-ac
Description:
Cups Wrapper drivers for ac brother printers
This package provides all cups wrapper drivers for models HL-4040CN HL-4040CDN HL-4050CDN HL-4070CDW MFC-9440CN MFC-9450CDN MFC-9840CDW DCP-9040CN DCP-9042CDN DCP-9045CDN
Homepage: http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/index.html
Version: 1.0.3-1-0ubuntu4
Section: multiverse/text