Ubuntu
syslinux package

  1. Xenial (16.04)
  2. Bug #277903
  3. Comment #43

Comment 43 for bug 277903

Revision history for this message
TJ (tj) wrote :

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.