Ubuntu Xenial preseed working update

Ubuntu16.04/UbuntuMate/Elementary/menu.cfg

+menu hshift 13
+menu width 49
+menu margin 8
+
+menu title Installer boot menu
+include stdmenu.cfg
+include txt.cfg
+include gtk.cfg
+menu begin advanced
+	menu title Advanced options
+	include stdmenu.cfg
+	label mainmenu
+		menu label ^Back..
+		menu exit
+	include adtxt.cfg
+	include adgtk.cfg
+menu end
+label help
+	menu label ^Help
+	text help
+   Display help screens; type 'menu' at boot prompt to return to this menu
+	endtext
+	config prompt.cfg

Ubuntu16.04/UbuntuMate/Elementary/txt.cfg

+default install
+label install
+  menu label ^Install Elementary Edition
+  kernel /install/vmlinuz
+  append  file=/cdrom/preseed/testelementary.seed vga=788 initrd=/install/initrd.gz quiet ---
+label hwe-install
+  menu label ^Install Ubuntu Server with the HWE kernel
+  kernel /install/hwe-vmlinuz
+  append  file=/cdrom/preseed/hwe-ubuntu-server.seed vga=788 initrd=/install/hwe-initrd.gz quiet ---
+label hd
+  menu label ^Boot from first hard disk
+  localboot 0x80