It is one among 3 options: "Use substitution table", "Use built-in fonts" and "Use outline fonts". Before, when the eps file exported from Origin was not being read properly by Inkscape, the latter option was checked. But then I checked the "Use built-in fonts"...

I had this problem for a long time, but this afternoon I realized how to solve it. In origin, when you export the graph to the .eps file, in the "EPS options" dialog box, look for "fonts - embedding" and check the box "Use built-in fonts". In this way, Inkscape will be ...