I think this is more an 'rules' thing. In post #18 I said that I did not
know what made it work but it did. I think it is because I downloaded
and installed Scangear from Canon's website. I did this to test the
printer and after that I removed the package again. However, it left a
'rules' files behind in /etc/udev/rules.d/ I cannot upload the file
because my internet is to slow :(

Anyway, you can create your own:
Open a text editor (kate or gedit)
Note that you'll need root permissions so open gedit or kate in a terminal like 
this: sudo gedit (or kate).
And paste the following lines:

# 80-canon_mfp2.rules
ACTION!="add", GOTO="canon_mfp_end"
SUBSYSTEM=="usb_device", GOTO="canon_mfp_start"
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", GOTO="canon_mfp_start"
GOTO="canon_mfp_end"
LABEL="canon_mfp_start"
#MG7500 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="177c", MODE="666"
#MG6600 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="177e", MODE="666"
#MG5600 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="177f", MODE="666"
#MG2900 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="1780", MODE="666"
#MB2000 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="1778", MODE="666"
#MB2300 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="1779", MODE="666"
#MB5000 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="1776", MODE="666"
#MB5300 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="1777", MODE="666"
#E460 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="1788", MODE="666"
#MX490 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="1787", MODE="666"
#E480 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="1789", MODE="666"
#MG7700 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="178b", MODE="666"
#MG6900 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="178c", MODE="666"
#MG6800 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="178d", MODE="666"
#MG5700 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="178e", MODE="666"
#MG3600 series
ATTR{idVendor}=="04a9", ATTR{idProduct}=="178a", MODE="666"
LABEL="canon_mfp_end"

Save the file as 80-canon_mfp2.rules under /etc/udev/rules.d/


I am not sure whether this works but you can always remove the file again. You 
can, of course, also download and install the Scangear package yourself.

Jurgen

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to sane-backends in Ubuntu.
https://bugs.launchpad.net/bugs/1577137

Title:
  saned.service masked and cannot be unmasked

Status in sane-backends package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to 16.04 (from 14.04) I noticed the sane daemon (sane-
  utils 1.0.25+git20150528-1ubuntu2) was no longer running. Attempting
  to manually start it results in systems complaining that the service
  is masked:

  kjetil at lucien in ~> sudo systemctl start saned
  Failed to start saned.service: Unit saned.service is masked.

  Unmasking it does not work:

  kjetil at lucien in ~> sudo systemctl unmask saned
  kjetil at lucien in ~> sudo systemctl start saned
  Failed to start saned.service: Unit saned.service is masked.

  kjetil at lucien in ~> ps u -C saned
  USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
  kjetil at lucien in ~>

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: sane-utils 1.0.25+git20150528-1ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Sun May  1 13:10:31 2016
  InstallationDate: Installed on 2012-08-01 (1368 days ago)
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 
(20120424.1)
  SourcePackage: sane-backends
  UpgradeStatus: Upgraded to xenial on 2016-04-24 (6 days ago)
  mtime.conffile..etc.default.saned: 2016-05-01T12:51:02.879807
  mtime.conffile..etc.sane.d.saned.conf: 2016-01-10T13:57:20.785810

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1577137/+subscriptions

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