[Bug 1424442] [NEW] installer creates unbootable system

[u. newbie]

Public bug reported:

Got a new computer, no OS yet, wrote ubuntu-14.04.1-server-amd64.iso to an USB stick, booted and installed.
However, a reboot brings me to the Asus UEFI EZ BIOS screen.  The Ubuntu system is unbootable.
This was on a 4TB disk, so a GPT partition table was necessary, and was used.
Ubuntu chose an oldfashioned install with boot code in the MBR.
As it turns out, the problem was that some code, I guess the Asus BIOS, tests bootability by checking the Boot flag of the appropriate partition in the MBR. In this case that appropriate partition is the type ee covering entry for the GPT partition table.
After setting that boot flag (with the fdisk 'a' command) the Ubuntu system booted fine.

Probably grub-install (or whatever software it is that installs this
boot code) should always set the Boot flag on the MBR partition.

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: boot install mbr

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https://bugs.launchpad.net/bugs/1424442

Title:
  installer creates unbootable system

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Got a new computer, no OS yet, wrote ubuntu-14.04.1-server-amd64.iso to an USB stick, booted and installed.
  However, a reboot brings me to the Asus UEFI EZ BIOS screen.  The Ubuntu system is unbootable.
  This was on a 4TB disk, so a GPT partition table was necessary, and was used.
  Ubuntu chose an oldfashioned install with boot code in the MBR.
  As it turns out, the problem was that some code, I guess the Asus BIOS, tests bootability by checking the Boot flag of the appropriate partition in the MBR. In this case that appropriate partition is the type ee covering entry for the GPT partition table.
  After setting that boot flag (with the fdisk 'a' command) the Ubuntu system booted fine.

  Probably grub-install (or whatever software it is that installs this
  boot code) should always set the Boot flag on the MBR partition.

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