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DVD with both 32-bit and 64-bit Ubuntu

You can create a DVD that contains both versions of the live CD:
  1. Download ubuntu-13.04-desktop-i386.iso and ubuntu-13.04-desktop-amd64.iso.
  2. Create a folder structure for the DVD:
    $ mkdir -p ubuntu-13.04-desktop-i386-amd64/boot/{grub,iso}
$ mv ubuntu-13.04-desktop-{i386,amd64}.iso ubuntu-13.04-desktop-i386-amd64/boot/iso/
  3. Save the following as ubuntu-13.04-desktop-i386-amd64/boot/grub/grub.cfg:
    # Derived from /boot/grub/loopback.cfg from ubuntu-13.04-desktop-i386.iso and ubuntu-13.04-desktop-amd64.iso.

menuentry "Try Ubuntu without installing (32-bit)" {
    loopback iso /boot/iso/ubuntu-13.04-desktop-i386.iso
    linux   (iso)/casper/vmlinuz  file=/cdrom/preseed/ubuntu.seed boot=casper iso-scan/filename=/boot/iso/ubuntu-13.04-desktop-i386.iso quiet splash --
    initrd  (iso)/casper/initrd.lz
}
menuentry "Try Ubuntu without installing (64-bit)" {
    set gfxpayload=keep
    loopback iso /boot/iso/ubuntu-13.04-desktop-amd64.iso
    linux   (iso)/casper/vmlinuz.efi  file=/cdrom/preseed/ubuntu.seed boot=casper iso-scan/filename=/boot/iso/ubuntu-13.04-desktop-amd64.iso quiet splash --
    initrd  (iso)/casper/initrd.lz
}
menuentry "Install Ubuntu (32-bit)" {
    loopback iso /boot/iso/ubuntu-13.04-desktop-i386.iso
    linux   (iso)/casper/vmlinuz  file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity iso-scan/filename=/boot/iso/ubuntu-13.04-desktop-i386.iso quiet splash --
    initrd  (iso)/casper/initrd.lz
}
menuentry "Install Ubuntu (64-bit)" {
    loopback iso /boot/iso/ubuntu-13.04-desktop-amd64.iso
    linux   (iso)/casper/vmlinuz.efi  file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity iso-scan/filename=/boot/iso/ubuntu-13.04-desktop-amd64.iso quiet splash --
    initrd  (iso)/casper/initrd.lz
}
menuentry "Check disc for defects (32-bit)" {
    loopback iso /boot/iso/ubuntu-13.04-desktop-i386.iso
    linux   (iso)/casper/vmlinuz  boot=casper integrity-check iso-scan/filename=/boot/iso/ubuntu-13.04-desktop-i386.iso quiet splash --
    initrd  (iso)/casper/initrd.lz
}
menuentry "Check disc for defects (64-bit)" {
    loopback iso /boot/iso/ubuntu-13.04-desktop-amd64.iso
    linux   (iso)/casper/vmlinuz.efi  boot=casper integrity-check iso-scan/filename=/boot/iso/ubuntu-13.04-desktop-amd64.iso quiet splash --
    initrd  (iso)/casper/initrd.lz
}
menuentry "Test memory" {
    loopback iso /boot/iso/ubuntu-13.04-desktop-i386.iso
    linux16 (iso)/install/mt86plus
}
  4. Generate an ISO image (You may need to install xorriso.):
    $ grub-mkrescue --output ubuntu-13.04-desktop-i386-amd64.iso ubuntu-13.04-desktop-i386-amd64
You can now burn ubuntu-13.04-desktop-i386-amd64.iso (1.6 GB) to a DVD and choose either 32-bit or 64-bit options at boot.
ubuntu-13.04-desktop-i386-amd64
Note: This worked for me in a virtual machine. I strongly recommend testing it using one DVD before burning multiple copies.
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