Hello, I am chiming in to say that I have the same issue. In my case this doesn't seem related to https://issues.guix.gnu.org/51252 , because I install the entire texlive package.
How to reproduce: put these lines into test.tex (also attached for convenience): \documentclass{article} \begin{document} text \end{document} Run lualatex test.tex: This is LuaTeX, Version 1.13.0 (TeX Live 2021/GNU Guix) restricted system commands enabled. kpathsea: Running mktexfmt lualatex.fmt /gnu/store/irzhgvy2zb6dd9g7a6b343pn4lvsn9n0-texlive-bin-20210325/share/texmf-dist/scripts/texlive/fmtutil.pl: Unexpected non-option argument(s): lualatex.fmt Try "fmtutil --help" for more information. I can't find the format file `lualatex.fmt'! Running pdflatex test.tex and xelatex test.tex works as expected. - Sergiu
test.tex
Description: TeX document