BOOT and ISO from a GPT disk

[pgmer6809]

If you search the net you will find several writeups on booting ISOs.
None of them worked for me.
I think it is because all of these write ups are written for MBR disks.
The basic approach is to write extra menu entries in the

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/etc/grub.d/40_custom 

file.
then do an

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update-grub

cmd.

Here is the entry that finally worked for me: (I have a separate partition where I keep ISOs, this is /dev/sda8)

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menuentry "Petra 64bit KDE ISO" {
insmod part_gpt
insmod ext2
insmod iso9660
set isofile="/linuxmint-16-kde-dvd-64bit.iso"
loopback loop (hd0,gpt8)$isofile
linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile noprompt noeject
initrd (loop)/casper/initrd.lz
} 

This menu entry is very similar to what is on the NET with the ADDITION of the 3 insmod lines,
I am not sure if all are required, but they do no harm. It depends I guess on which modules were built into grub at compile time and which need to be loaded.
Notice also that the loopback loop line has the format

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(hd0,gpt8)

In most write ups you see this is just give as

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(hd0,8)

which should default to an msdos/mbr type of disk.

pgmer6809