The issue with reflected gradients turned out to be the cause of a recently filed bug report (not yet verified with cairo-trace, but after changing all gradients from 'Repeat: reflect' to 'Repeat: none' the SVG file exports to PDF without issues):
Bug #511791 “PDF export fails with reflected gradients” <https://bugs.launchpad.net/inkscape/+bug/511791>
The issue with reflected gradients turned out to be the cause of a recently filed bug report (not yet verified with cairo-trace, but after changing all gradients from 'Repeat: reflect' to 'Repeat: none' the SVG file exports to PDF without issues):
Bug #511791 “PDF export fails with reflected gradients” /bugs.launchpad .net/inkscape/ +bug/511791>
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