Source
- the default PDF exporter from Inkscape can’t correctly export underlined text; this is a long standing issue that hasn’t been resolved yet
- the only solution to display the underlined text correctly, is to use the PNG exporter, instead
\begin{figure}[htb]
\includesvg[width=0.99\textwidth,inkscapeformat=png]{Server-Implementation-Components-Schema.drawio.svg}
\caption{Schematische Darstellung der Softwarekomponenten und ihren Beziehungen}%
\label{fig:Server-Implementation-Components-Schema}
\end{figure}%