我使用了此答案中的 4 行代码
效果很好。我刚刚换了新字体，发现现在出现了奇怪的错误。当我删除新字体包时，错误消失了。这都是用 lualatex 做的。我只用 lualatex。我按照使用字体的说明进行操作 http://www.tug.dk/FontCatalogue/urwschoolbookl/
最后得到了这个 MWE
\documentclass[chapterprefix=false]{scrbook}
\makeatletter
\renewcommand*{\chapterformat}{%
\mbox{\chapapp~\thechapter\autodot:\enskip}%
}
\makeatother
\IfFileExists{luatex85.sty}{\usepackage{luatex85}}{}
\usepackage{fontspec}
\usepackage{amssymb}
\usepackage{fouriernc} %added this per instructions
\usepackage[T1]{fontenc} %added this per instructions
\begin{document}
\chapter{test}
test
\end{document}
已编译
lualatex foo.tex
This is LuaTeX, Version 0.95.0 (TeX Live 2016)
restricted system commands enabled.
(./foo.tex
LaTeX2e <2016/03/31> patch level 2
Babel <3.9r> and hyphenation patterns for 1 language(s) loaded.
(/usr/local/texlive/2016/texmf-dist/tex/latex/koma-script/scrbook.cls
Document Class: scrbook 2016/06/14 v3.21 KOMA-Script document class (book)
(/usr/local/texlive/2016/texmf-dist/tex/latex/koma-script/scrkbase.sty
(/usr/local/texlive/2016/texmf-dist/tex/latex/koma-script/scrbase.sty
(/usr/local/texlive/2016/texmf-dist/scripts/oberdiek/oberdiek.luatex.lua)))
(/usr/local/texlive/2016/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg))
chapter 1.
(/usr/local/texlive/2016/texmf-dist/tex/latex/lm/t1lmss.fd)
...................
! LaTeX Error: Command \nobreakspace unavailable in encoding T1.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.17 \chapter{test}
?
删除这两行后错误消失
\usepackage{fouriernc} %added this
\usepackage[T1]{fontenc} %added this
或者保留上面两行，但删除makeatletter....一些东西。下面这个可以工作：
\documentclass[chapterprefix=false]{scrbook}%ext
\IfFileExists{luatex85.sty}{\usepackage{luatex85}}{}
\usepackage{fontspec}
\usepackage{amssymb}
\usepackage{fouriernc} %added this
\usepackage[T1]{fontenc} %added this
\begin{document}
\chapter{test}
test
\end{document}
没有错误。问题是：
\makeatletter
\renewcommand*{\chapterformat}{%
\mbox{\chapapp~\thechapter\autodot:\enskip}%
}
\makeatother
在上述情况下没有出现此错误？在 Linux 上使用 TL 2016。以下是文件列表
*File List*
scrbook.cls 2016/06/14 v3.21 KOMA-Script document class (book)
scrkbase.sty 2016/06/14 v3.21 KOMA-Script package (KOMA-Script-dependent bas
ics and keyval usage)
scrbase.sty 2016/06/14 v3.21 KOMA-Script package (KOMA-Script-independent b
asics and keyval usage)
keyval.sty 2014/10/28 v1.15 key=value parser (DPC)
scrlfile.sty 2016/06/14 v3.21 KOMA-Script package (loading files)
tocbasic.sty 2016/06/14 v3.21 KOMA-Script package (handling toc-files)
scrsize11pt.clo 2016/06/14 v3.21 KOMA-Script font size class option (11pt)
typearea.sty 2016/06/14 v3.21 KOMA-Script package (type area)
luatex85.sty 2016/06/15 v1.4 pdftex aliases for luatex
fontspec.sty 2016/02/01 v2.5a Font selection for XeLaTeX and LuaLaTeX
expl3.sty 2016/05/18 v6512 L3 programming layer (loader)
expl3-code.tex 2016/05/18 v6512 L3 programming layer
l3pdfmode.def 2016/03/26 v6465 L3 Experimental driver: PDF mode
xparse.sty 2016/05/18 v6512 L3 Experimental document command parser
luaotfload.sty 2016/06/16 v2.7 OpenType layout system
fontspec-luatex.sty 2016/02/01 v2.5a Font selection for XeLaTeX and LuaLaTeX
fontenc.sty
eu2enc.def 2010/05/27 v0.1h Experimental Unicode font encodings
eu2lmr.fd 2009/10/30 v1.6 Font defs for Latin Modern
xunicode.sty 2011/09/09 v0.981 provides access to latin accents and many oth
er characters in Unicode lower plane
eu2lmss.fd 2009/10/30 v1.6 Font defs for Latin Modern
graphicx.sty 2014/10/28 v1.0g Enhanced LaTeX Graphics (DPC,SPQR)
graphics.sty 2016/07/10 v1.0t Standard LaTeX Graphics (DPC,SPQR)
trig.sty 2016/01/03 v1.10 sin cos tan (DPC)
graphics.cfg 2016/06/04 v1.11 sample graphics configuration
luatex.def 2016/07/11 v0.01f Graphics/Color for luaTeX
infwarerr.sty 2016/05/16 v1.4 Providing info/warning/error messages (HO)
ltxcmds.sty 2016/05/16 v1.23 LaTeX kernel commands for general use (HO)
fontspec.cfg
amssymb.sty 2013/01/14 v3.01 AMS font symbols
amsfonts.sty 2013/01/14 v3.01 Basic AMSFonts support
fouriernc.sty 2005/12/20 1.0 fouriernc package
fourier.sty 2005/01/01 1.4 fourier-GUTenberg package
fontenc.sty
t1enc.def 2016/06/19 v1.99m Standard LaTeX file
t1lmr.fd 2009/10/30 v1.6 Font defs for Latin Modern
textcomp.sty 2016/06/19 v1.99m Standard LaTeX package
ts1enc.def 2001/06/05 v3.0e (jk/car/fm) Standard LaTeX file
fourier-orns.sty 2004/01/30 1.1 fourier-ornaments package
fontenc.sty
t1enc.def 2016/06/19 v1.99m Standard LaTeX file
t3cmr.fd 2001/12/31 TIPA font definitions
fmlfncmi.fd 2005/12/20 Fontinst v1.928 font definitions for FML/fncmi.
fmsfncm.fd 2005/12/20 Fontinst v1.928 font definitions for FMS/fncm.
fmxfutm.fd futm-extension
ts1cmr.fd 2014/09/29 v2.5h Standard LaTeX font definitions
t1fnc.fd 2005/12/13 scaled font definitions for T1/fnc.
supp-pdf.mkii
epstopdf-base.sty 2016/05/15 v2.6 Base part for package epstopdf
grfext.sty 2016/05/16 v1.2 Manage graphics extensions (HO)
kvdefinekeys.sty 2016/05/16 v1.4 Define keys (HO)
kvoptions.sty 2016/05/16 v3.12 Key value format for package options (HO)
kvsetkeys.sty 2016/05/16 v1.17 Key value parser (HO)
etexcmds.sty 2016/05/16 v1.6 Avoid name clashes with e-TeX commands (HO)
ifluatex.sty 2016/05/16 v1.4 Provides the ifluatex switch (HO)
pdftexcmds.sty 2016/05/21 v0.22 Utility functions of pdfTeX for LuaTeX (HO)
ifpdf.sty 2016/05/14 v3.1 Provides the ifpdf switch
luatex-loader.sty 2016/05/16 v0.6 Lua module loader (HO)
epstopdf-sys.cfg 2010/07/13 v1.3 Configuration of (r)epstopdf for TeX Live
t1lmss.fd 2009/10/30 v1.6 Font defs for Latin Modern
***********
附言：我知道\usepackage[T1]{fontenc}不需要新的 lualatex？但说明书上说要添加它。
答案1
我认为没有理由与依赖于传统字体的fontspec一起加载。fouriernc
加载luainputenc应保证与 相同的结果pdflatex。
\documentclass[chapterprefix=false]{scrbook}
\usepackage{luatex85}
\usepackage[T1]{fontenc}
\usepackage[utf8]{luainputenc}
\usepackage{fouriernc}
\begin{document}
\chapter{test}
test Münchener-Straße
\end{document}
如果您的目的是fouriernc在数学中使用，那么您可以使用 TeX Gyre Schola 作为文本字体：
\documentclass[chapterprefix=false]{scrbook}
\usepackage{luatex85}
\usepackage{fouriernc} % for math
\usepackage[no-math]{fontspec}
\setmainfont{TeX Gyre Schola}[Scale=0.95]
\begin{document}
\chapter{test}
test Münchener-Straße $a+b=\sum_{i=1}^n x_i\sin y$
\end{document}
当然你也可以使用unicode-math：
\documentclass[chapterprefix=false]{scrbook}
\usepackage{luatex85}
\usepackage{unicode-math}
\setmainfont{TeX Gyre Schola}[Scale=0.95]
\setmathfont{TeX Gyre Schola Math}[Scale=0.95]
\begin{document}
\chapter{test}
test Münchener-Straße $a+b=\sum_{i=1}^n x_i\sin y$
\end{document}
