[Bug 1512811] Re: 15.10 32 bit download gives error when run from usb

[Phillip Susi]

When you "use the iso file directly" you attach it to the virtual
machine either as a virtual hard disk, or a virtual cdrom.  Either
*should* work, but there are some important differences.

I suspect that the 32 bit image does not have a 32 bit grub boot loader
listed in the cdrom el torito boot catalog ( this is actually a known
issue ), and so it can't boot in UEFI mode.  Syslinux is included in the
image so that it can boot if used as a hard disk image, but if it is
somehow being used by the bios when it thinks the drive is a cdrom
instead, that could cause what you are seeing.  If so, attaching the iso
file as a virtual hard disk instead of a virtual cdrom should allow it
to work.

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https://bugs.launchpad.net/bugs/1512811

Title:
  15.10 32 bit download gives error when run from usb

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  There seems to be a problem with the grub when trying to use 15.10, 32 bit downloaded from the official Ubuntu site.
  The 64 bit version works fine.
  If I take ubuntu-15.10-desktop-i386.iso and use it to define a new virtual machine in virtual box, again all works well.
  Only if I use Startup disk creator to burn it to a usb disk on key there is a problem.
  Instead of Try Ubuntu coming up I immediately get a boot error.

  I tried downloading a second version of the iso and the problem
  repeated. Also if I download xubuntu-15.10-desktop-i386.iso the
  problem also appears.

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