/usr/share/genometools/gtdata/modules/gtdoclib/method_latex.lp is in genometools-common 1.5.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | \begin{minipage}{\textwidth}
\vspace{3mm}
\texttt{<%=name%><%if args ~= "" then %>(\textcolor{arggrey}{<%=args%>})<%end%>}\\[-.4cm]
\hangindent3em
\hangafter=0
<%=comment%>
\end{minipage}
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