/usr/share/oem-config-slideshow/slides/welcome.html is in oem-config-slideshow-ubuntu 83.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <div class="header"><h1 class="slidetitle">Welcome</h1></div>
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<p>Thank you for choosing Ubuntu 14.04. This version brings some exciting changes including a totally redesigned desktop interface, Unity. While Ubuntu is configured, this slideshow will show you around.</p>
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<img class="background" src="screenshots/welcome.jpg" />
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