My problem now fixed by going very carefully through the brother brscan4 
They are quite lengthy and call for a # of preconditions to be met.
 Successfully installed and in service.
This, after an upgrade to Ubuntu 16.04.

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  Simple Scan and Sane hang greyed out

Status in simple-scan package in Ubuntu:

Bug description:
  Sane has not been working at all.
   Simple Scan, XSane, and other associated programs detect and offer installed 
scanners, choose one then screen greys out after a long wait.
  Using Ubuntu 15.04
   check and update every day
  This scanner has been functioning commanded by PC and by scanner panel 
buttons for many months but now hangs with a grey screen and red note "failed 
to scan Unable to connect to scanner"
   I have tried al sorts but mostly up against a brick wall for the last few 
  Printer operates properly.

  This might help
  david@david-Lenovo-H535:~$ simple-scan -d
  [+0.00s] DEBUG: simple-scan.vala:594: Starting Simple Scan, PID=10884
  [+0.00s] DEBUG: Connecting to session manager
  [+0.04s] DEBUG: ui.vala:1880: Loading state from 
  [+0.04s] DEBUG: ui.vala:1848: Restoring window to 600x400 pixels
  [+0.04s] DEBUG: autosave-manager.vala:64: Loading autosave information
  [+0.04s] DEBUG: autosave-manager.vala:259: Waiting to autosave...
  [+0.04s] CRITICAL: gtk_event_controller_reset: assertion 
'GTK_IS_EVENT_CONTROLLER (controller)' failed
  [+0.23s] DEBUG: autosave-manager.vala:281: Autosaving book information
  [+0.23s] DEBUG: ui.vala:1971: Saving state to 
  [+0.23s] DEBUG: scanner.vala:1446: sane_init () -> SANE_STATUS_GOOD
  [+0.23s] DEBUG: scanner.vala:1452: SANE version 1.0.24
  [+0.23s] DEBUG: scanner.vala:1513: Requesting redetection of scan devices
  [+0.23s] DEBUG: scanner.vala:802: Processing request
  [+0.39s] DEBUG: ui.vala:1971: Saving state to 
  [+11.32s] DEBUG: scanner.vala:338: sane_get_devices () -> SANE_STATUS_GOOD
  [+11.32s] DEBUG: scanner.vala:350: Device: name="brother4:net1;dev2" 
vendor="Brother" model="*HaroParkScanner" type="k"
  [+11.32s] DEBUG: scanner.vala:350: Device: name="brother4:net1;dev1" 
vendor="Brother" model="*DCP-7065DN" type="DCP7065DN"
  [+11.32s] DEBUG: scanner.vala:350: Device: name="brother4:net1;dev0" 
vendor="Brother" model="*UpstairsScan" type="DCP7065DN"
  Expected scanner function.
  Simple scan window greyed out/hing had to force quit after 5 min.


  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: simple-scan
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue May 19 16:45:01 2015
  InstallationDate: Installed on 2015-01-29 (110 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 10117
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic 
root=UUID=94709fac-8bfa-41bf-8d29-24abdd9f77cc ro quiet splash vt.handoff=7
  SourcePackage: simple-scan
  UpgradeStatus: Upgraded to vivid on 2015-05-16 (3 days ago) 11/05/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: I7KT31AUS
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058 STD
  dmi.chassis.type: 3
  dmi.chassis.vendor: LENOVO
dmi:bvnLENOVO:bvrI7KT31AUS:bd11/05/2013:svnLENOVO:pn10117:pvrLenovoH535:rvnLENOVO:rn:rvr31900058STD:cvnLENOVO:ct3:cvr: 10117
  dmi.product.version: Lenovo H535
  dmi.sys.vendor: LENOVO

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