[Bug 912431] Re: Preseeded 12.04 grub-install failed: Wrong number of args: mapdevfs <path>

[Roger Binns]

Just did  a fresh text install (twice) of 14.04 and the install grub
step failed with exactly the same symptoms.  Trying to do things
manually results in a boot where I get dumped into initramfs

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Title:
  Preseeded 12.04 grub-install failed: Wrong number of args: mapdevfs
  <path>

Status in “debian-installer-utils” package in Ubuntu:
  Fix Released
Status in “grub-installer” package in Ubuntu:
  Invalid

Bug description:
  Using the latest precise amd64 mini.iso, grub-install has recently
  started to fail on preseeded installations.  The preseeds have
  remained pretty static relative to mini.iso updates.  I"m not sure
  this is directly related to grub-installer as there hasn't been an
  upload in ~12 weeks, but I am unsure where else to file this.

  After failure, grub-install reports the following in syslog (also
  attached):

  Jan  5 18:19:21 in-target: grub-common is already the newest version.
  Jan  5 18:19:21 in-target: 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  Jan  5 18:19:21 main-menu[494]: (process:27699): Wrong number of args: mapdevfs <path>
  Jan  5 18:19:21 main-menu[494]: WARNING **: Configuring 'grub-installer' failed with error code 1
  Jan  5 18:19:21 main-menu[494]: WARNING **: Menu item 'grub-installer' failed.

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