[Bug 2072929] Re: Ubuntu cloud image partition numbering

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~simpoir/livecd-rootfs/+git/livecd-rootfs/+merge/470026

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https://bugs.launchpad.net/bugs/2072929

Title:
  Ubuntu cloud image partition numbering

Status in cloud-images:
  In Progress
Status in cloud-images noble series:
  New
Status in cloud-images oracular series:
  In Progress
Status in livecd-rootfs package in Ubuntu:
  In Progress

Bug description:
  Hi,

  When downloading an image (e.g. noble) from https://cloud-
  images.ubuntu.com/ and unpacking it onto a disk (using `qemu-img`), we
  see that the partition numbering starts at 1, skips number 2-13 and
  continues with 14:

  sda       8:0    0   10G  0 disk
  ├─sda1    8:1    0    9G  0 part /
  ├─sda14   8:14   0    4M  0 part
  ├─sda15   8:15   0  106M  0 part /boot/efi
  └─sda16 259:0    0  913M  0 part /boot

  This hits a limitation in Dell's PowerFlex SDC (storage) when trying to launch Ubuntu noble based VMs backed by PowerFlex disks.
  We have experienced this recently in the LXD team whilst adding support for SDC in our LXD PowerFlex storage driver.

  Dell supports at max 15 partitions on their disks, see
  https://www.dell.com/support/manuals/en-us/scaleio/flex-software-
  to-46x/product-
  limits?guid=guid-a8f27cd4-d5f7-4993-93ea-0a739256633d&lang=en-us:

  > Maximum file system partitions per volume: 15

  This wasn't an issue before as the maximum partition number in the
  jammy image is 15.

  In order to resolve this issue a proposal could be changing the
  partition numbers to start at 13 so that we still stay in the limit of
  15.

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