LaTeX.org

I found a workaround.
Here is how I did.
As I am using the Warsaw theme, I found the corresponding file in the texmf-dist directory:

$ find /usr/share/texmf-dist -name '*Warsaw*'
/usr/share/texmf-dist/tex/latex/beamer/beamerthemeWarsaw.sty

Here is the content of this file:

$ cat /usr/share ...

Hello,
With beamer, I am using the Warsaw theme.
I am using texlive 20200327.

Here is my code:
\documentclass[10pt]{beamer}

\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}
\usepackage{times}

\mode<presentation>{\usetheme{Warsaw}\setbeamercovered{transparent ...

Bartman, sorry I forgot to link my crossposts.
Stefan Kottwitzn, thanks your solution with \@gobbletwo is working.
Samcarter, thanks your solution with \setbeamertemplate is working too.

I found the footline template definition in this file: /usr/share/texmf-dist/tex/latex/beamer ...

Hello,

With beamer, I would like to add the frame number to the footer.
I am using texlive 20200327.

Here is my code:
\documentclass{beamer}
\usetheme{Warsaw}
\title{Beamer Example}

% https://texblog.net/latex-archive/uncategorized/beamer-footline-frame-number/
\newcommand*\oldmacro{}%
\let ...