I have DCP-1610W which used to work just fine using Simple Scan before upgrading from 18.04 to 20.04.
brscan-skey seems to think it's fine
➜ brscan-skey -l DCP-1610W : brother4:net1;dev0 : 192.168.2.184 Active
brsaneconfig4 as well
➜ brsaneconfig4 -q ... Devices on network 0 DCP-1610W "DCP-1610W" I:192.168.2.184
and it looks like all the drivers are up to date
➜ dpkg -l | grep Brother ii brother-udev-rule-type1 1.0.2 all Brother udev rule type 1 ii brscan-skey 0.2.4-1 amd64 Brother Linux scanner S-KEY tool ii brscan4 0.4.5-1 amd64 Brother Scanner Driver ii dcp1610wcupswrapper:i386 3.0.1-1 i386 Brother DCP-1610W CUPS wrapper driver ii dcp1610wlpr:i386 3.0.1-1 i386 Brother DCP-1610W LPR driver ii printer-driver-brlaser 6-1build1 amd64 printer driver for (some) Brother laser printers ii printer-driver-ptouch 1.4.2-3 amd64 printer driver Brother P-touch label printers
It's just that Simple Scan (now Document Scanner) says
No scanners detected after a brief search.
All the similar posts suggest the fixes which I have already had to apply to get the scanner working in 18.04, like making sure that the drivers found in
/usr/lib64/sane/ are also available under