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Here is a mwe

\documentclass[]{book}
c \usepackage{fontspe}
\begin{document}
test
\end{document}

This is the error:

(/usr/share/texlive/texmf-dist/tex/latex/base/fontenc.sty
! Font \TU/lmr/m/n/10=[lmroman10-regular]:+tlig; at 10pt not loadable: metric d
ata not found or bad.
<to be read ...

I did upgraded my operating system (devuan excalibur) and in so doing lost access to the
libertinus font, even though I believe it is automatically comes with TexLive. I did register
fonts for LaTeX. Here is a mwe

\documentclass{memoir}
\usepackage{libertinus}
\begin{document}
test
\end ...

Not a solution, but work-around, I built my project up paragraph by paragraph the problem disappeared. I appreciate the help.

I need to elaborate my prior message. This .tex file:


\documentclass{article}
\usepackage{libertine}
\begin{document}
test
\end{document}


Produces the same error when compiled with lualatex as when \usepackage{fontspec| or \usepackage{polyglossia} is instead included. I get sense that my ...

An important piece of information If failed to include is that neither the pdflatex nor the lualatex command
produce the error when run on this primitive file:


\documentclass{article}
\begin{document}
test
\end{document}


But when I add the use of the polyglossia or fontspec package I get ...

Stefan, you have been very patient. I suspect I made a misstep in my installation and so will how reinstall. In the past, installation instructions said that if you are installing over a broken installation, you should remove files such as /usr/local/texlive/2024 and ~/.texlive2024. But that ...

Debian wiki recommended installing as user and so I did so

# tlmgr install luaotfload
(running on Debian, switching to user mode!)
(see /usr/share/doc/texlive-base/README.tlmgr-on-Debian.md)
TLPDB: not a directory, not loading: /root/texmf
tlmgr: user mode not initialized, please read the ...

Stefan, your suggestion appreciated, but did not have much luck with it.

# tlmgr install texlive-luatex
(running on Debian, switching to user mode!)
(see /usr/share/doc/texlive-base/README.tlmgr-on-Debian.md)
TLPDB: not a directory, not loading: /root/texmf
tlmgr: user mode not initialized, please ...

I newly installed Debian and TeXLive. I also used ELPA to install AUXTeX.

I have a small test file

\documentclass{article}
\usepackage{polyglossia}
\begin{document}
\end{document}

I get the error:

ERROR: Font \TU/lmr/m/n/10=[lmroman10-regular]:+tlig; at 10pt not loadable: metric data not ...

I reinstalled my operating system and lost a LaTeX prrocess function that apparently had previously been automatic. My practice had been to put a master LaTeX file in one emacs split screen and the included LaTeX file I'm working on in the other screen. When I process the master file, the output ...