Ah, ok. Using pdfLatex, try to use \usepackage{newtxtext,newtxmath} below \usetheme in tex file
\usetheme{Ufg} \usepackage{newtxtext,newtxmath}
To change the font of titles, comment line 11 in sty file
\mode<presentation> % \usefonttheme[onlymath]{serif}
result:
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Ah, ok.
Using pdfLatex, try to use \usepackage{newtxtext,newtxmath} below \usetheme in tex file
To change the font of titles, comment line 11 in sty file
result: