Hi,

Today I boot up jammy-desktop-amd64.iso from grub. 
My 40_custom file

menuentry "Ubuntu 20.04.4 ISO" {
    set isoimg="/iso/ubuntu-20.04.4-desktop-amd64.iso"
    loopback loop (hd1,msdos1)$isoimg
    linux (loop)/casper/vmlinuz boot=casper toram iso-scan/filename=$isoimg
    initrd (loop)/casper/initrd
    }

menuentry "Ubuntu 22.04 ISO" {
    set isoimg="/iso/jammy-desktop-amd64.iso"
    loopback loop (hd1,msdos1)$isoimg
    linux (loop)/casper/vmlinuz boot=casper toram iso-scan/filename=$isoimg
    initrd (loop)/casper/initrd
    }

ubuntu 20.04.4 boot up fine.
but jammy-destop-amd64.iso is display same messages forever.
and I could not Ctrl-C, then I reset PC.

init: line 49: can't open /dev/sr0: no medium found

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https://bugs.launchpad.net/bugs/1967753

Title:
  Ubuntu Jammy Desktop ISO installer fails to find live filesystem on
  Mac Pro 2012 (Mac 5,1 Westmere)

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