[Bug 277903] Re: Missing Operating System [message at boot]

[TJ]

DjznBR: Your issue may be caused by allowing the PC to boot the
installer image using Legacy/BIOS mode, rather than its native UEFI
mode.

ISO Desktop images are hybrid; that is they are configured to boot in
any of three different modes:

1. In UEFI mode using the Simple Boot Path (EFI/BOOT/BOOTX64.EFI) with GPT and an EFI System Partition (bootable as optical media or removable mass storage)
2. In BIOS mode using the hybrid/protective MBR containing the isolinux boot-strap and isolinux.bin
3. As pure ISO9660 media using the BIOS El Torito boot specification for CD/DVD media

These combinations allow the device to boot as removable optical media
or removable mass storage on BIOS and UEFI systems.

If you experienced the "Missing operating system" message the UEFI PC
tried to boot the image using Legacy BIOS/Compatibility Support Module
mode. You'll not see that message when booting in UEFI mode.

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https://bugs.launchpad.net/bugs/277903

Title:
  Missing Operating System [message at boot]

Status in Ubuntu CD Images:
  New
Status in syslinux package in Ubuntu:
  In Progress

Bug description:
  I'm reviving this report since the issue is still present in 14.04 and
  15.10 syslinux, which is used in the various flavour hybrid ISOs, via
  mbr/isohdpfx.{S,bin}

  The same system I originally reported in comment #30 is still
  affected.

  Original upstream discussion (March 2009):
  http://www.syslinux.org/archives/2009-March/012254.html

  Peter reworked the patches in 2009 and created additional MBRs with
  the suffix "_c" (press Ctrl to force disk 0x80) and "_f"
  (unconditionally force disk 0x80).

  See: http://www.syslinux.org/wiki/index.php/Mbr

  These images are in the Ubuntu 14.04 package but were removed (in
  Debian) with:

  syslinux (3:6.03~pre19+dfsg-3) unstable; urgency=low

    * Also skipping isohd*x_{c,f}.bin in syslinux-common.
    ...

   -- Daniel Baumann <daniel.baumann at progress-linux.org>  Sun, 24 Aug
  2014 00:19:38 +0200

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