linux grub install mint

vim /boot/grub/custom.cfg

menuentry "LinuxMint" {
set isofile="/miso/linuxmint-18.3-xfce-64bit.iso"
set dri="free"
search --no-floppy -f --set=root $isofile
probe -u $root --set=abc
set pqr="/dev/disk/by-uuid/$abc"
loopback loop $isofile
linux (loop)/miso/vmlinuz img_dev=$pqr img_loop=$isofile driver=$dri
initrd (loop)/miso/initrd.lz
}

update-grub