[Bug 1274320] Re: Error: diskfilter writes are not supported

[Victor Rodriguez]

The patch mentioned in post #34 is not working for me. I'm using an LVM
over a RAID1 for / and another RAID1 for swap.

As mentioned here:

https://forum.manjaro.org/index.php?topic=7425.msg112623#msg112623

seems like Grub tries to write something to /boot. If /boot is on a LVM
and/or RAID volume Grub is unable to do so and we get that error.

Adding
GRUB_SAVEDEFAULT=false

to
/etc/default/grub

solved the issue for me. I don't care that Grub does not remember my
last chosen option.

I don't know whether this is a bug or simply Grub can't write to
LVM/RAID volumes and I should have created a small /boot partition
outside the LVM and/or RAID. Please, someone clarify this.

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https://bugs.launchpad.net/bugs/1274320

Title:
  Error: diskfilter writes are not supported

Status in GRand Unified Bootloader:
  New
Status in “grub2” package in Ubuntu:
  Triaged
Status in “grub2” package in Fedora:
  Unknown

Bug description:
  Once grub chooses what to boot to, an error shows up and will sit on
  the screen for approx. 5 seconds

  "Error: diskfilter writes are not supported.
  Press any key to continue..."

  From what I understand, this error is related to raid partitions, and
  I have two of them (md0, md1). Both partitions are used (root and
  swap). Raid is assembled with mdadm and are raid0

  This error message started appearing right after grub2 was updated on
  01/27/2014.

  System:    Kernel: 3.13.0-5-generic x86_64 (64 bit) Desktop: KDE 4.11.5 Distro: Ubuntu 14.04 trusty
  Drives:    HDD Total Size: 1064.2GB (10.9% used)
          1: id: /dev/sda model: SanDisk_SDSSDRC0 size: 32.0GB
          2: id: /dev/sdb model: SanDisk_SDSSDRC0 size: 32.0GB
          3: id: /dev/sdc model: ST31000528AS size: 1000.2GB
  RAID:      Device-1: /dev/md1 - active raid: 0 components: online: sdb2 sda3 (swap)       Device-2: /dev/md0 - active raid: 0 components: online: sdb1 sda1 ( / )
  Grub2:    grub-efi-amd64 version 2.02~beta2-5

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: grub-efi-amd64 2.02~beta2-5
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  Uname: Linux 3.13.0-5-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Wed Jan 29 17:37:59 2014
  SourcePackage: grub2
  UpgradeStatus: Upgraded to trusty on 2014-01-23 (6 days ago)

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