/etc/cobbler/pxe/gpxe_system_esxi5.template is in cobbler-common 2.4.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #!gpxe
kernel http://$server:$http_port/cobbler/ks_mirror/$ks_mirror_name/mboot.c32
imgargs mboot.c32 -c http://$server:$http_port/cblr/svc/op/bootcfg/system/$name BOOTIF=$mac_address_eth0
boot
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