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• Short answer, for the impatient (it may not work!) If you lazy, you can try this: $ xdg-mime default kde4-okularApplication_pdf.desktop application/pdf ... which will add an entry under "[Default Applications]" in your ~/.local/share/application…

  in Zotero opens PDF files in GIMP, KRITA, KARBON instead of OKULAR Comment by Richard Gomes December 23, 2013