/usr/share/live/images/lxde-desktop/config/bootloaders/pxelinux/pxelinux.0 is in live-image-lxde-desktop 5.0~a5-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/live/images/lxde-desktop/config/bootloaders/pxelinux/../../../../../../../lib/PXELINUX/pxelinux.0