[Bug 1354730] Re: 14.04 grub-install failed: Wrong number of args: mapdevfs <path>

[TJ]

On 10/08/14 08:02, Willem Ligtenberg wrote:
> Is there a way I can test this patch?

1. Start the installer and pause it at some user prompt
2. Start a terminal shell (switch to an alternative VT or start an xterm or if using -server install use the "Execute a Shell" main-menu option)
3. Execute "sed -i 's/\($chroot $ROOT grub-probe $@\)/\1 | head -1/' /usr/bin/grub-installer
4. Return to the installer and continue

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https://bugs.launchpad.net/bugs/1354730

Title:
  14.04 grub-install failed: Wrong number of args: mapdevfs <path>

Status in “grub-installer” package in Ubuntu:
  Triaged

Bug description:
  I was previously able to install ubuntu on a root btrfs filesystem in raid1 mode as I described here:
  http://askubuntu.com/questions/87241/how-to-install-using-btrfs-in-raid10-mode

  So I used gparted to create btrfs partitions on all the disksand left
  1 MB at the beginning of the disks for GRUB. (I also tried 2, and 5)

  Then later I made the btrfs filesystem as follows:
  mkfs.btrfs -m raid1 -d raid1 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
  And performed:
  btrfs dev scan

  Then I went back through normal installation.

  I am now trying to do this again, using Ubuntu 14.04.
  Everything goes fine up to the point that it wants to install grub.
  It mentions the error in the title and fails.

  Apparently, somebody else also reported an error like this with 14.04.
  https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/912431 (at the bottom a person mentions that it occurs in 14.04)

  I will attach some files later.

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