Botched attempt to update TL'20

[Phelype Oleinik]

Hi Paulo,

On Wed, Dec 9, 2020 at 9:49 PM Paulo Ney de Souza <pauloney at gmail.com> wrote:
>

This document:

> \documentclass{report}
>
> \begin{document}
> A
> \end{document}
> ----

Cannot possibly make this log:

> it comes back with:
>
> ----
> aulo at OptiPlex-3070:~/Dropbox/IMPA/CMU$ latex att
> This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (preloaded format=latex)
>  restricted \write18 enabled.
> entering extended mode
> (./att.tex
> LaTeX2e <2020-02-02> patch level 5
> L3 programming layer <2020-07-17>
> (/usr/local/texlive/2020/texmf-dist/tex/latex/base/article.cls
> Document Class: article 2020/04/10 v1.4m Standard LaTeX document class
> (/usr/local/texlive/2020/texmf-dist/tex/latex/base/size10.clo))
> (/usr/local/texlive/2020/texmf-dist/tex/latex/geometry/geometry.sty
> (/usr/local/texlive/2020/texmf-dist/tex/latex/graphics/keyval.sty)
> (/usr/local/texlive/2020/texmf-dist/tex/generic/iftex/ifvtex.sty
> (/usr/local/texlive/2020/texmf-dist/tex/generic/iftex/iftex.sty)))
> (/usr/local/texlive/2020/texmf-dist/tex/latex/lipsum/lipsum.sty
> (/usr/local/texlive/2020/texmf-dist/tex/latex/l3kernel/expl3.sty

Because neither 'geometry' nor 'lipsum' are loaded by the report class.
The error you show, however:

> ! LaTeX Error: Missing \begin{document}.
>
> See the LaTeX manual or LaTeX Companion for explanation.
> Type  H <return>  for immediate help.
>  ...
>
> l.77      \ExplLoaderFileDate{expl3.sty}}
>                                          %
> ? x

Happens when the expl3 core loaded in the LaTeX format differs from the
one in your TeX tree.  This usually happens when you have a local format
file, and then you update and have a mismatched expl3.  The solution in
that case is to delete (or regenerate) the local format.  That said,
it might have happened that l3kernel got updated but fmtutil didn't run
due to the failed update, so getting it to run all the way through will
probably fix the problem.

Best,

Phelype