Here's a procedure that worked for me in Ubuntu 18.04 Bionic.

For this procedure the user is "bob"

1) Install the latest brscan2 package (I have brscan2-0.2.5-1.amd64.deb
which I downloaded in 2014)

2) Manually link the drivers brscan2 installed into /usr/lib/x86_64
-linux-gnu/sane/ and /usr/lib/x86_64-linux-gnu/

  bob:~$ cd /usr/lib/x86_64-linux-gnu/sane

  bob:/usr/lib/x86_64-linux-gnu/sane$ sudo ln -sf /usr/lib64/sane
/libsane-brother2.so

[sudo] password for bob:

  bob:/usr/lib/x86_64-linux-gnu/sane$ sudo ln -sf 
/usr/lib64/sane/libsane-brother2.so.1
  bob:/usr/lib/x86_64-linux-gnu/sane$ sudo ln -sf 
/usr/lib64/sane/libsane-brother2.so.1.0.7 
  
  bob:/usr/lib/x86_64-linux-gnu/sane$ cd ..
  
  bob:/usr/lib/x86_64-linux-gnu$ sudo ln -sf /usr/lib64/libbrcolm2.so
  bob:/usr/lib/x86_64-linux-gnu$ sudo ln -sf /usr/lib64/libbrcolm2.so.1
  bob:/usr/lib/x86_64-linux-gnu$ sudo ln -sf /usr/lib64/libbrcolm2.so.1.0.1 
  bob:/usr/lib/x86_64-linux-gnu$ sudo ln -sf /usr/lib64/libbrscandec2.so
  bob:/usr/lib/x86_64-linux-gnu$ sudo ln -sf /usr/lib64/libbrscandec2.so.1
  bob:/usr/lib/x86_64-linux-gnu$ sudo ln -sf /usr/lib64/libbrscandec2.so.1.0.0 


3) At this point scanimage -L should detect the scanner when run as root. 

  $ sudo scanimage -L

3a) If it doesn't work and especially if you're running something other
than Ubuntu Bionic, you might make verify SANE is looking in the right
directory using the debug flag

  $ SANE_DEBUG_DLL=128 scanimage -L

4) Create a udev file so the scanner is accessible to a scanner group

  $ sudo gedit /lib/udev/rules.d/96-brother-scanner.rules

   -- with the following contents:

# Brother DCP-7020 scanner
SUBSYSTEMS=="usb" \
, ATTRS{idVendor}=="04f9" \
, ATTRS{idProduct}=="0183" \
, ACTION=="add", \
, MODE="0664", \
, GROUP="scanner" \
, ENV{libsane_matched}="yes"

# note this udev instruction ends lines with \
# backslash so the single comma-separated 
# udev command is not crammed onto one line. 
# END OF FILE


5) Add the user bob to the scanner group (as specified in the udev file above):

  $ sudo adduser bob scanner

6) If you're bob and you weren't already in the group you'll have to log
out and back in, or reboot the system. To reload udev:

  $ sudo udevadm control --reload-rules

--> Everything should work after you reboot / login / reload. Yay.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to cups in Ubuntu.
https://bugs.launchpad.net/bugs/701856

Title:
  Brother's printer/scanner drivers awkward to find and install

Status in cups package in Ubuntu:
  Opinion

Bug description:
  Binary package hint: cupsys

  Hello,

  I have the multifonction laser printer and scan Brother DCP-7030.

  It works very well in Ubuntu, but with some hard configuration.
  Printer is automatically detected when connected in USB, but Ubuntu
  does not propose DCP-7030 drivers, only DCP-7025, and it doesn't work
  well.

  To get DCP-7030 fully recognized and well printing / scanning, I have to do 
this (it's a short summary) :
  http://solutions.brother.com/linux/en_us/before.html

  - Printer BROTHER DCP-7030 :

  cd ~/desktop
  sudo aa-complain cupsd
  sudo mkdir /usr/share/cups/model
  http://solutions.brother.com/linux/en_us/download_prn.html#DCP-7030
  sudo dpkg -i --force-all --force-architecture brdcp7030lpr-2.0.2-1.i386.deb
  sudo dpkg -i --force-all --force-architecture 
cupswrapperDCP7030-2.0.2-1.i386.deb
  http://127.0.0.1:631/printers/DCP7030 : OK

  After that printer works

  
  - SCANNING :

  Install scan-key-tools  /  Brscan3
  http://solutions.brother.com/linux/en_us/download_scn.html#brscan3
  http://solutions.brother.com/linux/en_us/instruction_scn1a.html

  sudo gedit /lib/udev/rules.d/50-udev-default.rules : in section
  "libusb device nodes", replacer 0664 by 0666

  sudo lsusb
  Bus 001 Device 004: ID 04f9:01a Brother Industries, Ltd
  Go to dev/bus/usb : bus 1 and device 4 is root owned
  Open it in Nautilus as root, change it to my user name and take ownership

  Now Simple Scan works, Brother-DCP is seen.

  But... big problem !

  At each restart of Ubuntu or DCP Brother, permission resets and comes
  back to root, I have to change ownership and re-log each time, this is
  not nice...

  Is it a way to "protect" the file against erasing or permission change
  ?

  It's also true for other models than DCP-7030 (like DCP-7040...). I do
  not know if it is a Cups / Ubuntu "bug" or Openprinting missing for
  new drivers, but as Brother gives functional drivers for Linux, this
  should be easily implemented I hope, as more and more materials are
  natively identified in Ubuntu.

  Thanks in advance for your help. Best regards,

  Xavier

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