/usr/share/kivy-examples/includes/layout.kv is in python-kivy-examples 1.9.1-1build3.
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 | #:kivy 1.8.1
#:include button.kv
<CustomLayout>:
SpecialButton:
text: 'Includes!'
|