我似乎无法使用 TeXLive 附带的 TrueType 字体，例如 DejaVu。
lualatex根据此示例输入进行编译失败：
\documentclass{article}
\usepackage{fontspec}
\begin{document}
\fontspec{DejaVu Serif}
DejaVu Serif Test
\end{document}
我做错了什么（vanilla TeXLive-2017，Linux x86_64（Gentoo））？
*.log：
This is LuaTeX, Version 1.0.4 (TeX Live 2017) (format=lualatex 2018.1.19) 26 JAN 2018 12:03
restricted system commands enabled.
**ttftest.tex
(./ttftest.tex
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LaTeX Font Info: Redeclaring font encoding TU on input line 82.
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(load luc: /home/grahn/bin/texlive/2017/texmf-var/luatex-cache/generic/fonts/otl
/lmroman10-bold.luc)(load luc: /home/grahn/bin/texlive/2017/texmf-var/luatex-cac
he/generic/fonts/otl/lmroman10-italic.luc)
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\openout1 = ttftest.aux
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(Font) OT1/cmtt/m/n --> TU/lmtt/m/n on input line 4.
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(Font) TU/lmr/m/n --> TU/lmr/bx/n on input line 4.
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(Font) OT1/cmr/bx/it --> TU/lmr/bx/it on input line 4.
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(Font) OT1/cmss/bx/n --> TU/lmss/bx/n on input line 4.
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(Font) OT1/cmtt/m/n --> TU/lmtt/bx/n on input line 4.
...texmf-dist/tex/luatex/luaotfload/luaotfload-database.lua:454: bad argument #1
to 'load' (function expected, got nil).
<to be read again>
\scan_stop:
l.5 \fontspec{DejaVu Serif}
? x
Here is how much of LuaTeX's memory you used:
9902 strings out of 494478
100000,383344 words of node,token memory allocated 355 words of node memory still in use:
2 hlist, 1 rule, 1 dir, 3 attribute, 49 glue_spec, 3 attribute_list, 1 write
nodes
avail lists: 2:12,3:3,4:1,5:3,7:2,8:1,9:2
14043 multiletter control sequences out of 65536+600000
26 fonts using 5677687 bytes
39i,0n,33p,358b,229s stack positions out of 5000i,500n,10000p,200000b,500000s
warning (pdf backend): no pages of output.
PDF statistics: 0 PDF objects out of 1000 (max. 8388607)
0 named destinations out of 1000 (max. 131072)
1 words of extra memory for PDF output out of 10000 (max. 100000000)
答案1
您的缓存似乎已损坏，请尝试删除
~/bin/texlive/2017/texmf-var/luatex-cache
并让 luatex (luaotfload) 重建它。