/usr/share/live/build/bootloaders/pxelinux/menu.cfg is in live-build 3.0~a57-1ubuntu34.
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 | menu hshift 0
menu width 82
menu title Boot menu
include stdmenu.cfg
include live.cfg
include install.cfg
menu end
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