LaTeX Error: Command \widering already defined

Question

I keep getting this error whenever I start an article with the basic set of packages:

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{makeidx}
\usepackage{graphicx}
\usepackage{lmodern}
\usepackage{kpfonts}
\usepackage{fourier}
\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\begin{document}
text
\end{document}

I understand it's the command \widering being defined in two different packages at the same time, but I don't know how to get around the problem. How could I fix the issue?

Welcome to TeX.SX! It doesn't make sense to load both kpfonts and fourier: the second package will override the first anyway, as they both set the fonts for the document. — egreg, Apr 27 '14 at 10:38
possible duplicate of Two conflicting packages in one document — doable? — Rüdiger Voigt, Apr 27 '14 at 11:23

score 14 · Accepted Answer · answered Apr 27 '14 at 10:56

Loading kpfonts together with fourier does not make sense: they are both font packages that define a font family (with accompanying math fonts) for the document. So, even if there were no error message, loading kpfonts before fourier would result in the former package being overridden by the latter.

So the remedy is simple:

if you want the Fourier fonts (based on Utopia), remove \usepackage{kpfonts};
if you want the KPfonts, remove \usepackage{fourier};
if you want the standard Computer Modern fonts, remove both.

Package yhmath shows a similar conflict with kpfonts, while not with lmodern. — Andrestand, Dec 27 '23 at 13:29

LaTeX Error: Command \widering already defined

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