Kmail, and possibly Firefox, wanted to open PDFs with Dolphin, at least at the start of a session. I found that the menu entry for Okular was hidden. Un-hiding it solves the problem.
Kmail, and possibly Firefox, wanted to open PDFs with Dolphin, at least at the start of a session. I found that the menu entry for Okular was hidden. Un-hiding it solves the problem.