[Bug 1300346] Re: Upgrade from Precise fails to boot

[Patrick Domack]

# debconf-show grub-pc
  grub-pc/kopt_extracted: false
  grub2/kfreebsd_cmdline:
  grub2/device_map_regenerated:
* grub-pc/install_devices:
  grub-pc/postrm_purge_boot_grub: false
  grub-pc/install_devices_failed_upgrade: true
  grub-pc/disk_description:
* grub2/linux_cmdline: elevator=noop
* grub-pc/install_devices_empty: true
  grub2/kfreebsd_cmdline_default: quiet
  grub-pc/partition_description:
  grub-pc/install_devices_failed: false
  grub-pc/install_devices_disks_changed:
* grub2/linux_cmdline_default: consoleblank=0 splash quiet
  grub-pc/chainload_from_menu.lst: true
  grub-pc/hidden_timeout: true
  grub-pc/mixed_legacy_and_grub2: true
  grub-pc/timeout: 10

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https://bugs.launchpad.net/bugs/1300346

Title:
  Upgrade from Precise fails to boot

Status in “grub2” package in Ubuntu:
  Incomplete

Bug description:
  I have several ubuntu 12.04 systems. On testing some of them to
  upgrade to 14.04, a few of them fail.

  All the systems where updated to the moment before the trusty upgrade,
  so they where running 12.04.04 at upgrade time.

  The ones that work file, seem to be installed recently. Installs from
  like 12.04.02 or later, maybe 12.04.01 also, but not sure.

  The older ones, fail after the first reboot, grub hangs with a
  blinking curser. The Loading Grub appears and vanishs almost
  instantly, and grub refuses to display the menu.

  If I boot a recovery cd, and manually re-install grub to the
  harddrive, using install-grub /dev/sda, there is no more failures.

  So it appears on systems that don't have a new enough grub bootloader
  code, the upgrade fails to upgrade it, making the system unbootable.

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