\usepackage{subfigure}
…
\begin{figure}
\subfigure[図(a)の説明]{\includegraphics[clip, width=0.33\columnwidth]{figurea1eps}}
\subfigure[図(b)の説明]{\includegraphics[clip, width=0.33\columnwidth]{figure2.eps}}
\subfigure[図(c)の説明]{\includegraphics[clip, width=0.33\columnwidth]{figure3.eps}}
\caption{図の説明}
\label{ラベル}
\end{figure}
! LaTeX Error: File `subfigure.sty' not found.
$ sudo apt-get install texlive-latex-extra