\documentclass{beamer}
\usetheme{linutronix}
\usepackage{german}
\usepackage[utf8]{inputenc}
\usepackage{pgf}
\usepackage{graphicx}
\usepackage{lxextras}

\title{Block \lq Was ist Linux?\rq}
\institute{Linutronix GmbH}

\begin{document}

\maketitle

% ----- Slide ------------------
\begin{frame}
\begin{figure}[h]
\centering
\includegraphics[width=8cm]{images/myimage.jpg}
\end{figure}
\end{frame}


\end{document}