I have followed this guide for installing the scanner driver:
And this post:
This has always worked for me on Ubuntu 10.10.
But now on Xubuntu 12.04 it doesn't work anymore. Simple Scan says it couldn't find any printers.
Printing works fine though.
Also when I start my laptop it says saned is disabled. I don't know if that makes any difference. I did try starting saned, but Simple Scan still couldn't find any scanners.
remco@laptop:~$ sudo dpkg -i --force-all ./brscan-skey-0.2.3-0.amd64.deb
Selecting previously unselected package brscan-skey.
(Reading database ... 224874 files and directories currently installed.)
Unpacking brscan-skey (from .../brscan-skey-0.2.3-0.amd64.deb) ...
Setting up brscan-skey (0.2.3-0) ...
remco@laptop:~$ sudo dpkg -i --force-all ./brscan3-0.2.11-4.amd64.deb
Selecting previously unselected package brscan3.
(Reading database ... 224882 files and directories currently installed.)
Unpacking brscan3 (from ./brscan3-0.2.11-4.amd64.deb) ...
Setting up brscan3 (0.2.11-4) ...
remco@laptop:~$ dpkg -l | grep Brother
ii brscan-skey 0.2.3-0 Brother Linux scanner S-KEY tool
ii brscan3 0.2.11-4 Brother Scanner Driver
ii mfc6490cwcupswrapper:i386 1.1.2-2 Brother CUPS Inkjet Printer Definitions
ii mfc6490cwlpr:i386 1.1.2-2 Brother lpr Inkjet Printer Definitions
ii printer-driver-ptouch 1.3-3 printer driver Brother P-touch label printers
remco@laptop:~$ brsaneconfig3 -a name=Scanner model=MFC-6490CW ip=192.168.2.109
remco@laptop:~$ brsaneconfig3 -q | grep Scanner
0 Scanner "MFC-6490CW" I:192.168.2.109
remco@laptop:~$ dpkg -l | grep sane
ii libsane 1.0.22-7ubuntu1 API library for scanners
ii libsane:i386 1.0.22-7ubuntu1 API library for scanners
ii libsane-common 1.0.22-7ubuntu1 API library for scanners -- documentation and support files
ii libsane-hpaio 3.12.2-1ubuntu3 HP SANE backend for multi-function peripherals
ii sane-utils 1.0.22-7ubuntu1 API library for scanners -- utilities