[Bug 1334909] Re: Persistent error after upgrade: ERROR: unsupported sector size 4096 on /dev/sdb

[Dimitri John Ledkov]

This seems to come from ./grub-core/disk/xen/xendisk.c I think. This
seems like a minor point to complain about this loudly to everyone who
is using 4k drives.

** Also affects: grub2 (Ubuntu)
   Importance: Undecided
       Status: New

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

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Title:
  Persistent error after upgrade: ERROR: unsupported sector size 4096 on
  /dev/sdb

Status in grub2 package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  Hardware: Asus U56E
  Upgrade from Xubuntu 13.10 64-bit to 14.04 64-bit

  # lsb_release -rd
  Description:	Ubuntu 14.04 LTS
  Release:	14.04

  I just upgraded to 14.04.  During the upgrade I received the error: "
  ERROR: unsupported sector size 4096 on /dev/sdb." multiple times.
  Here is an excerpt from /var/log/apt/term.log:

  ----------------------------------------------------------------------------
  Found memtest86+ image: /boot/memtest86+.bin
  ERROR: unsupported sector size 4096 on /dev/sdb.
  ERROR: unsupported sector size 4096 on /dev/sdb.
  ERROR: unsupported sector size 4096 on /dev/sdb.
  ERROR: unsupported sector size 4096 on /dev/sdb.
  ERROR: unsupported sector size 4096 on /dev/sdb.
  ERROR: unsupported sector size 4096 on /dev/sdb.
  ERROR: unsupported sector size 4096 on /dev/sdb.
  ERROR: unsupported sector size 4096 on /dev/sdb.
  grub-probe: error: unknown filesystem
  Found Windows Recovery Environment (loader) on /dev/sda1
  Found Windows 7 (loader) on /dev/sda2
  ----------------------------------------------------------------------------

  /dev/sdb is an external USB-attached 3TB Seagate Backup Plus disk that
  has been attached to 13.10 since it was upgrade, and has caused no
  problems.

  The upgrade acted as though there were unrecoverable errors and that
  the upgrade would be backed out, but it continued and finished the
  upgrade to 14.04. There were a few minor configuration problems with
  the upgrade, but it appear to work properly. However, now, every time
  I reboot, I get a blank screen with the message:

  ERROR: unsupported sector size 4096 on /dev/sdb.

  Then the system hangs for about 30 seconds or so before continuing
  with the boot into xfce4.  Once up, both the Thunar and Nautilus file
  managers see the Seagate disk and are able to mount and navigate it
  without problem.

  The Seagate disk is being used as formatted from the factory.
  gparted-pkexec and gnome-disks diagree on sizes, but show an initial
  8.0/8.4Mb unallocated partition followed by /dev/sdb1 with 2.73/3.0Tb
  NTFS filesystem and then another unallocated 4.46/4.7Mb partition.

  From this information and the fact that this message is not logged in
  any system file, I would assume the the problem is with the grub
  loader.

  While this problem is investigated further, is there any way to stop
  the boot delay when this message is displayed?

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.2
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Thu Jun 26 17:17:15 2014
  InstallationDate: Installed on 2012-04-17 (800 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to trusty on 2014-06-25 (1 days ago)
  VarLogDistupgradeTermlog:

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