[Bug 1062737] [NEW] hybrid images do not include a valid GPT

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The insyde UEFI firmware implementation does not see the GPT on the
hybrid images generated on nusakan (e.g., the 12.10 beta2 image).  This
appears to be consistent with what both gdisk and parted show:

$ gdisk -l ~/devel/iso/ubuntu-12.10-beta2-desktop-amd64.iso 
GPT fdisk (gdisk) version 0.8.5

Partition table scan:
  MBR: MBR only
  BSD: not present
  APM: not present
  GPT: not present


***************************************************************
Found invalid GPT and valid MBR; converting MBR to GPT format.
***************************************************************

Disk /home/vorlon/devel/iso/ubuntu-12.10-beta2-desktop-amd64.iso: 1548288 sectors, 756.0 MiB
Logical sector size: 512 bytes
Disk identifier (GUID): 1ADDF8C9-5CE1-41A4-9124-2CC80EED991F
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1548254
Partitions will be aligned on 2048-sector boundaries
Total free space is 1548221 sectors (756.0 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
$

Removing the -partition_offset 16 option from the xorriso commandline is
sufficient to generate an image with a recognizable partition table; but
I imagine this causes other problems for hybrid systems.

** Affects: ubuntu-cdimage
     Importance: High
         Status: Fix Released

** Affects: libisofs (Ubuntu)
     Importance: Undecided
         Status: Triaged

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hybrid images do not include a valid GPT
https://bugs.launchpad.net/bugs/1062737
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