Test2.pdf is a postscript file, not pdf. So it will be rendered by
ghostscript when viewed with evince.

The problem is caused by libreoffice. The "gradient" is actually a
series of shaded rectangles. In fact the rectangles are not even
correctly aligned. There is a tiny gap between each one. Cairo (used by
evince) has a problem with showing lines between adjacent fills due to
antialiasing. There is no easy way to fix this. And the small gaps
between the rectangles caused by libreoffice will make the problem
worse.

The best solution is for libreoffice to use PDF gradients to draw the
shading.

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https://bugs.launchpad.net/bugs/164233

Title:
  [Upstream] [hardy] Opening pdf with smooth gradient in Evince displays
  striped

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