/etc/cobbler/pxe/pxesystem.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 5 6 7 | default linux
prompt 0
timeout 1
label linux
kernel $kernel_path
ipappend 2
$append_line
|