/usr/share/syslinux/themes/ubuntu-wily/isolinux-live/prompt.cfg is in syslinux-themes-ubuntu-wily 12.
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 16 | prompt 1
display f1.txt
timeout 50
include menu.cfg
include exithelp.cfg
f1 f1.txt
f2 f2.txt
f3 f3.txt
f4 f4.txt
f5 f5.txt
f6 f6.txt
f7 f7.txt
f8 f8.txt
f9 f9.txt
f0 f10.txt
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