% monoref -- "Page X of Y" footer in a single pass, using \lastpage
% together with fancyhdr. Compile ONCE:  lualatex 05-page-of-total.tex
\documentclass{article}
\usepackage{lipsum}
\usepackage{fancyhdr}
\usepackage{monoref}
\pagestyle{fancy}
\fancyhf{}
\cfoot{Page \thepage\ of \lastpage}
\renewcommand\headrulewidth{0pt}
\begin{document}

\section{Chapter one}\label{sec:one}
Every footer reads ``Page X of \lastpage'' with the correct total,
resolved in one compilation. See Section~\ref{sec:two}.
\lipsum[1-8]

\section{Chapter two}\label{sec:two}
\lipsum[1-8]

\end{document}