My daily driver is UbuntuMATE 16.04LTS and my printer is on my wireless LAN. UbuntuMATE 16.04LTS never listed my printer and the recommended driver printed terrible copies so used a WIN7 or SOLIS machine when I needed perfect copies. I downloaded UbuntuMATE 18.04Beta and noticed that my printer was printing perfect copies so I knew there was a solution somewhere and hunted it down.
Finally got my Brother MFC-L2705DW printer to print perfect copies on UbuntuMATE 16.04LTS. I used the Brother install tool (released in 12/2017) linux-brprinter-installer-2.2.0-1.gz on their support page. You will have to drill down to your specific model and select linux (.deb file)
Brother printer drivers
It’s a Command line install and near the end It asked for a URI (since it’s on the net) so I took a chance and copied the URI from the 18.04 install and it worked, I installed simple scan from APP GRID application in the boutique and that works also.