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• Firstly, you should make sure that okular is your default software to open PDFs. See here: https://askubuntu.com/a/204825/738478 Then, open Zotero and doublie-click on any of your references that contain a PDF. Now, the PDF should open in okular. …

  in Linux - How to interconnect zotfile with okular Comment by Larsschoebitz September 21, 2017