[Bug 973486] Re: error: invalid blocklist

[Otus]

Below in the output from debconf-show. The computer has two HDDs:
SAMSUNG_HD642JJ (640GB, /dev/sdb) and SAMSUNG_HD103SJ (1TB, /dev/sda).
Precise is on the former.

  grub-pc/kopt_extracted: false
  grub2/kfreebsd_cmdline:
  grub2/device_map_regenerated:
* grub-pc/install_devices: /dev/disk/by-id/ata-SAMSUNG_HD642JJ_S1AFJDWS402000
  grub-pc/postrm_purge_boot_grub: false
  grub-pc/install_devices_failed_upgrade: true
  grub-pc/disk_description:
* grub2/linux_cmdline:
  grub-pc/install_devices_empty: false
  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: quiet splash
  grub-pc/chainload_from_menu.lst: true
  grub-pc/hidden_timeout: false
  grub-pc/mixed_legacy_and_grub2: true
  grub-pc/timeout: 5

** Changed in: grub2 (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/973486

Title:
  error: invalid blocklist

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  From bug #972221 comment #4:

  I get this message at boot after the most recent grub update. I didn't
  get it before and didn't see any errors when updating grub. (It did
  ask and overwrite my /etc/default/grub which I had modified.)

  --

  Unlike the reporter of that bug, I still see this with version
  1.99-21ubuntu1 of the grub packages. It doesn't come up every boot,
  but every once in a while (may be connected to whether I reboot
  to/from Windows or do a hard boot, but can't say for sure).

  The exact error message is:

  "error: invalid blocklist

  Press any key to continue..."

  This message comes up after the Ubuntu kernel has been selected.
  Pressing a key lets the boot continue normally.

  Additionally before the grub screen comes up a black screen with the
  message "error: invalid blocklist" repeated twice flashes by quickly.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: grub2 (not installed)
  ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
  Uname: Linux 3.2.0-21-generic x86_64
  ApportVersion: 2.0-0ubuntu4
  Architecture: amd64
  Date: Wed Apr  4 18:33:46 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120319)
  ProcEnviron:
   TERM=xterm
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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