Dave Goldsbrough, it will help immensely if you filed a new report with Ubuntu 
via a terminal:
ubuntu-bug libsane

Please feel free to subscribe me to it.

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Packages, which is subscribed to simple-scan in Ubuntu.

  simple-scan doesn't work with MG5350 anymore (wifi)

Status in simple-scan package in Ubuntu:

Bug description:
  Was working very fine until I upgraded to Ubuntu 15.04 to 15.10

  Ubuntu 15.10 64bits

  $ simple-scan -d
  [+0,00s] DEBUG: simple-scan.vala:674: Starting Simple Scan 3.18.1, PID=7498
  [+0,00s] DEBUG: Connecting to session manager
  [+0,05s] DEBUG: ui.vala:2018: Loading state from 
  [+0,05s] DEBUG: ui.vala:1986: Restoring window to 883x400 pixels
  [+0,05s] DEBUG: autosave-manager.vala:64: Loading autosave information
  [+0,05s] DEBUG: autosave-manager.vala:259: Waiting to autosave...
  [+0,05s] CRITICAL: gtk_event_controller_reset: assertion 
'GTK_IS_EVENT_CONTROLLER (controller)' failed
  [+0,08s] DEBUG: scanner.vala:1446: sane_init () -> SANE_STATUS_GOOD
  [+0,08s] DEBUG: scanner.vala:1452: SANE version 1.0.25
  [+0,08s] DEBUG: scanner.vala:1513: Requesting redetection of scan devices
  [+0,08s] DEBUG: scanner.vala:802: Processing request
  [+0,15s] DEBUG: autosave-manager.vala:281: Autosaving book information
  [+0,19s] DEBUG: ui.vala:2109: Saving state to 
  [+3,75s] DEBUG: simple-scan.vala:404: Requesting scan at 150 dpi from device 
  [+3,75s] DEBUG: scanner.vala:1559: Scanner.scan ("(null)", dpi=150, 
scan_mode=ScanMode.GRAY, depth=2, type=ScanType.SINGLE, paper_width=0, 
paper_height=0, brightness=0, contrast=0)
  [+4,34s] DEBUG: scanner.vala:338: sane_get_devices () -> SANE_STATUS_GOOD
  [+4,34s] DEBUG: scanner.vala:350: Device: name="pixma:MG5300_192.168.1.83" 
vendor="CANON" model="Canon PIXMA MG5300" type="multi-function peripheral"
  [+4,34s] DEBUG: scanner.vala:802: Processing request
  [bjnp] udp_command: ERROR - no data received
  [bjnp] bjnp_init_device_structure: Cannot read mac address, skipping this 
  [+17,00s] DEBUG: scanner.vala:863: sane_open ("pixma:MG5300_192.168.1.83") -> 
  [+17,00s] WARNING: scanner.vala:867: Unable to get open device: Invalid 
  [+17,10s] DEBUG: ui.vala:2109: Saving state to 
  [+82,44s] DEBUG: ui.vala:2109: Saving state to 
  [+125,63s] DEBUG: ui.vala:2109: Saving state to 
  [+130,72s] DEBUG: autosave-manager.vala:195: Deleting autosave records
  [+130,72s] DEBUG: scanner.vala:1586: Stopping scan thread
  [+130,72s] DEBUG: scanner.vala:802: Processing request
  [+130,73s] DEBUG: scanner.vala:1597: sane_exit ()

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