To reinstall grub2 with v1.99, you really need the save version of Ubuntu to use the two line easy mount and install commands.
But, I think you can always chroot into an install and then you are using the current version.
I create my own multiboot USB with grub2. I think your MultiBoot uses grub4dos and I am not familiar with the details.
I think this grub2 entry was working for me, but I see I had to edit the entry (old one is the # commented out)
Code:
menuentry "slitaz " {
set isofile="/boot/iso/slitaz-3.0.iso"
loopback loop $isofile
linux (loop)/boot/bzImage rw root=/dev/null lang=C kmap=us screen=1024x768x16 autologin noprompt noeject
initrd (loop)/boot/rootfs.gz
# linux (loop)/boot/bzImage isofrom=$isofile boot=live quiet vga=791 noeject noprompt
}
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