grub2 multiboot

grub.cfg

insmod part_msdos
insmod ext2
insmod loop
insmod search_fs_uuid

menuentry "Linux Mint" {
    search --no-floppy --set=isopart --fs-uuid ec0e9e38-2b0b-4dde-9416-d71782e3cc50
    set isofile="/linuxmint-18.1-mate-64bit.iso"
    loopback loop ($isopart)$isofile
    linux (loop)/casper/vmlinuz boot=casper noprompt noeject iso-scan/filename=$isofile
    initrd (loop)/casper/initrd.lz
}

menuentry "Linux Mint Debian Edition" {
    search --no-floppy --set=isopart --fs-uuid ec0e9e38-2b0b-4dde-9416-d71782e3cc50
    set isofile="/lmde-2-201701-cinnamon-64bit.iso"
    loopback loop ($isopart)$isofile
    linux (loop)/live/vmlinuz boot=live findiso=${isofile} debug
    initrd (loop)/live/initrd.lz
}

menuentry "Ubuntu" {
    search --no-floppy --set=isopart --fs-uuid ec0e9e38-2b0b-4dde-9416-d71782e3cc50
    set isofile="/ubuntu-16.10-desktop-amd64.iso"
    loopback loop ($isopart)$isofile
    linux (loop)/casper/vmlinuz.efi boot=casper noprompt noeject iso-scan/filename=$isofile
    initrd (loop)/casper/initrd.lz
}

menuentry 'Fedora' {
    search --no-floppy --set=isopart --fs-uuid ec0e9e38-2b0b-4dde-9416-d71782e3cc50
    set isofile='/Fedora-Workstation-Live-x86_64-25-1.3.iso'
    loopback loop ($isopart)$isofile
    linux (loop)/isolinux/vmlinuz root=live:CDLABEL=Fedora-WS-Live-25-1-3 rd.live.image iso-scan/filename=$isofile
    initrd (loop)/isolinux/initrd.img
}

menuentry "Debian netinst" {
    search --no-floppy --set=isopart --fs-uuid ec0e9e38-2b0b-4dde-9416-d71782e3cc50
    set isofile="/debian-testing-amd64-netinst.iso"
    loopback loop ($isopart)$isofile
    linux ($isopart)/debian/vmlinuz debconf/priority=medium noprompt noeject iso-scan/filename=$isofile
    initrd ($isopart)/debian/initrd.gz
}

menuentry "Windows installer" {
  insmod ntldr
  insmod ntfs
  search --no-floppy --set=root --fs-uuid C969-993D
  ntldr ($root)/bootmgr
}