日本語のJupyter NotebookをPDFとしてダウンロードする ref: https://qiita.com/masa-ita/items/8d5ebe8afe0d580af184

base.tplx

((= Latex base template (must inherit)
This template builds upon the abstract template, adding common latex output
functions.  Figures, data_text,
This template does not define a docclass, the inheriting class must define this.=))

((*- extends 'document_contents.tplx' -*))

%===============================================================================
% Abstract overrides
%===============================================================================

((* block header *))
    ((* block docclass *))((* endblock docclass *))

    ((* block packages *))
    \usepackage[T1]{fontenc}
    \usepackage{jalinebreak}
    \setlength{\parindent}{0in}

...（以下略）

bash

sudo texhash
kpsewhich jalinebreak.sty

jalinebreak.sty

\XeTeXlinebreaklocale "ja"
\XeTeXlinebreakskip=0pt plus 1pt
\XeTeXlinebreakpenalty=0

\def\<{\@ifstar{\zx@hwback\nobreak}{\zx@hwback\relax}}
\def\zx@hwback#1{\leavevmode#1\hskip-.5em\relax}