Comment # 8 on bug 1176557 from Dr. Werner Fink

(In reply to G.M. Venekamp from comment #7)
> I just finished a zypper dup and I am now on:
> 
> # cat /etc/os-release 
> NAME="openSUSE Tumbleweed"
> # VERSION="20200923"
> 
> Testing a LaTeX document fails with the same error again.
> 
> LC_ALL=C lualatex sram-for-u2connect.tex 
> This is LuaHBTeX, Version 1.12.0 (TeX Live 2020/TeX Live for SUSE Linux) 
>  restricted system commands enabled.
> 
> ---! lualatex.fmt was written by luatex
> (Fatal format file error; I'm stymied)
> 
> This is what I have after zypper dup:
> 
> > ll /usr/bin/lualatex
> lrwxrwxrwx 1 root root 8 Sep 23 21:19 /usr/bin/lualatex -> luahbtex
> 
> Applying your suggested fix:
> 
> # ln -sf luatex /usr/bin/lualatex
> 
> The LaTeX document compiles again.
> 
> 
> LuaHBTeX is apparently something new and improves hte shaping of various
> scripts. Some info can be found here:
> https://www.latex-project.org/news/latex2e-news/ltnews31.pdf
> 
> Regards,
> Gerben

Yes upstream has switched to luahbtex as engine in fmtutil.cnf ... please run
as root

  fmtutil-sys --refresh

then try again to see if this does help as this should refresh the format files
which then should be luahbtex based.