How to tell grub.cfg to use isolinux.cfg menu

I've built a custom iso based on Ubuntu 16.04 that boots in both UEFI and CSM (was originally CSM only). I'd like to have grub use the menu in isolinux.cfg. Is there a way to manage this or do I have to build a separate menu in grub.cfg? My isolinux.cfg follows:

PROMPT 0
TIMEOUT 75
DEFAULT menu.c32
F1 help.txt
MENU RESOLUTION 1024 768
MENU TABMSG [F1] help [Tab] options
# Dimensions configured for
MENU TITLE Foxclone
LABEL standard
MENU DEFAULT
MENU LABEL Start ^Foxclone KERNEL /casper/vmlinuz APPEND boot=casper initrd=/casper/initrd.lz vga=791 quiet splash --
TEXT HELP If boot fails, reboot and try selecting Safe Mode instead
ENDTEXT
LABEL safe
MENU LABEL ^Safe Mode KERNEL /casper/vmlinuz APPEND boot=casper initrd=/casper/initrd.lz xforcevesa nomodeset vga=ask toram --
TEXT HELP Prompts for a video mode and loads the USB image into RAM
ENDTEXT
LABEL check
MENU LABEL ^Check USB for defects KERNEL /casper/vmlinuz APPEND boot=casper integrity-check initrd=/casper/initrd.lz splash --
TEXT HELP Verify integrity of USB drive
ENDTEXT
LABEL memtest
MENU LABEL ^Memory test KERNEL /install/memtest APPEND -
TEXT HELP Check computer memory for errors
ENDTEXT
menu color screen 37;40 #80ffffff #00000000 std
menu color border 30;44 #40000000 #00000000 std
menu color title 1;36;44 #c00090f0 #00000000 std
menu color unsel 37;44 #90ffffff #00000000 std
menu color hotkey 1;37;44 #ffffffff #00000000 std
menu color sel 7;37;40 #e0000000 #20ff8000 all
menu color hotsel 1;7;37;40 #e0400000 #20ff8000 all
menu color disabled 1;30;44 #60cccccc #00000000 std
menu color scrollbar 30;44 #40000000 #00000000 std
menu color tabmsg 31;40 #90ffff00 #00000000 std
menu color cmdmark 1;36;40 #c000ffff #00000000 std
menu color cmdline 37;40 #c0ffffff #00000000 std
menu color pwdborder 30;47 #80ffffff #20ffffff std
menu color pwdheader 31;47 #80ff8080 #20ffffff std
menu color pwdentry 30;47 #80ffffff #20ffffff std
menu color timeout_msg 37;40 #80ffffff #00000000 std
menu color timeout 1;37;40 #c0ffffff #00000000 std
menu color help 37;40 #c0ffffff #00000000 std
menu color msg07 37;40 #90ffffff #00000000 std

Thanks in advance.

7 Sorted by: Reset to default

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