/usr/share/gazebo-9/media/gui/fonts/DejaVuSans-10.font is in gazebo9-common 9.0.0+dfsg5-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | <?xml version="1.0" ?>
<Font Name="DejaVuSans-10" Filename="DejaVuSans.ttf" Type="FreeType" Size="10" NativeHorzRes="800" NativeVertRes="600" AutoScaled="true"/>
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