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

[Mathieu Trudel-Lapierre]

As I recall there is also a branch to bring this to Trusty, but it's not
closing the bug.

(fwiw, that's https://code.launchpad.net/~tj/ubuntu/trusty/grub-
installer/lp1354730/+merge/230222)

I'm nominating this for Trusty, so as soon as you have time to update
the branch (following the same changes as done in vivid), TJ, we can SRU
this... but this bug report will also need an update of it's description
for the SRU process
(http://wiki.ubuntu.com/StableReleaseUpdates#Procedure).

Thanks!

** Also affects: grub-installer (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: grub-installer (Ubuntu Trusty)
   Importance: Undecided => Medium

** Changed in: grub-installer (Ubuntu Trusty)
       Status: New => Triaged

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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:
  Fix Released
Status in grub-installer source package in Trusty:
  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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