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[Henk van der Laak <henk@xxxxxxxxxxx>]

I had an older version of libopencv_highgui.so installed in /opt/lib.
This was a remnant from building Blender myself in the recent past.
So "non-standard" means "other version than is in the Ubuntu repo".

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https://bugs.launchpad.net/bugs/1772441

Title:
  Blender fails to start, libopencv_highgui not found

Status in blender package in Ubuntu:
  Opinion

Bug description:
  
  $ sudo apt install blender

  $ blender
  blender: error while loading shared libraries: libopencv_highgui.so.2.4: cannot open shared object file: No such file or directory

  $ ldd /usr/bin/blender | grep found
  libopencv_highgui.so.2.4 => not found
  libopencv_imgproc.so.2.4 => not found
  libopencv_core.so.2.4 => not found

  $ cat /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=18.04
  DISTRIB_CODENAME=bionic
  DISTRIB_DESCRIPTION="Ubuntu 18.04 LTS"

  $ uname -a
  Linux henklaak-desktop 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

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