/usr/share/live/build/bootloaders/syslinux/install.cfg is in open-infrastructure-system-build 20161101-lts2-2.
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 | label install
menu label ^Install
linux /install/vmlinuz
initrd /install/initrd.gz
append vga=788 @APPEND_INSTALL@ --- quiet
label installgui
menu label ^Graphical install
linux /install/gtk/vmlinuz
initrd /install/gtk/initrd.gz
append video=vesa:ywrap,mtrr vga=788 @APPEND_INSTALL@ --- quiet
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