Thanks for your bug report. Your example works for me, and others, this
is highly likely to be a problem with your specific video card and video
card driver stack.

Does the following work around the crash?

  close all
  graphics_toolkit gnuplot
  imshow (a)

If so, then it is likely due to OpenGL problems with your specific video
card and the way that Octave renders plots with OpenGL by default.

** Changed in: octave (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1493283

Title:
  Octave crashes with imshow()

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