Quoting Rohan McLeod (rhn(a)jeack.com.au):
Bob via luv-main wrote:
I have set a box for a friend running Kubuntu 16.04 with a brother
MF7680DW multifunction printer/scanner attached via usb.
Are you sure that model number is correct ; google can't seem to find it !
I suspect: Brother MFC-7860DW Compact Monochrome Laser All-in-One Printer
(Note digit transposition.)
There's some sort of dismal proprietary binary-only SANE driver from the
manufacturer. (Personally, I regard that as the manufacturer telling
you 'Hullo, you bought unwisely, and should sell this hardware to
someone and buy a replacement supported by open source, but perhaps
that's just me.)