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![Ask Ubuntu](//cdn.sstatic.net/Sites/askubuntu/Img/apple-touch-icon.png)
Have you installed the Brother Linux drivers: https://www.brother.com.au/en/support/DCP-L3510CDW/downloads? For Ubuntu you will need the DEB version of the package, and you want to be using the "Driver Install Tool", current version is 2.2.4-1.
Unpack the .gz file, and run the script using sudo,...