I recently got my hands on a refurbished Brother DS-640 scanner, & can't get it to work on Solus, but I did get it working on Linux Mint DE with the .Deb file from the Brother website, and on Manjaro Gnome by installing Brscan5 from the AUR, I've tried Brscan4 found in the repos here, but no luck with any scanner software, the closest it gets is with the Gnome Document Scanner that shows Brother Unknown, then when trying to scan no dice. So if someone smarter than myself could get Brscan 5 ported over, as it would really be great for us fans of Brother Printers/scanners, and so I can switch my mother's PC back from Manjaro Gnome to Solus Budgie that's much easier, for her to use, and more stable I would be forever grateful, Thank you!