[Bug 720558] Re: Ubuntu 10.04 currently requires groot= workaround with pvgrub

[Colin Watson]

I've run the same pair of Xen and non-Xen tests against this new grub
package in Maverick, and both now pass.  Phew.

** Tags removed: verification-done-lucid verification-done-natty
verification-needed

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https://bugs.launchpad.net/bugs/720558

Title:
  Ubuntu 10.04 currently requires groot= workaround with pvgrub

Status in “grub” package in Ubuntu:
  Fix Released
Status in “grub-installer” package in Ubuntu:
  Invalid
Status in “grub” source package in Lucid:
  Fix Committed
Status in “grub-installer” source package in Lucid:
  Invalid
Status in “grub” source package in Maverick:
  Fix Committed
Status in “grub-installer” source package in Maverick:
  Invalid
Status in “grub” source package in Natty:
  Fix Committed
Status in “grub-installer” source package in Natty:
  Invalid

Bug description:
  Stable update justification:

  Impact: Part of a set of bugs rendering it impossible to install any Ubuntu release from Lucid onwards as a Xen guest using d-i.  (The others are bug 857548 and bug 857662, which affect only Natty and Oneiric.)
  Development branch: Fixed in grub 0.97-29ubuntu63 in Oneiric.
  Patch: http://bazaar.launchpad.net/~ubuntu-core-dev/grub/lucid-proposed/revision/905?compare_revid=903, and similar for other releases.
  TEST CASE: Install in a Xen guest and watch it fail as described below, or not.  You'll need to use the boot parameter 'apt-setup/proposed=true' to test the fix.
  Regression potential: A limited number of people are still using GRUB Legacy anyway.  I'd be pretty surprised if this broke anything other than Xen, which was already broken in this situation anyway.

  Original report:

  Binary package hint: debian-installer

  Forwarded from a kind source outside;  this was found and documented
  (for their customers) by a Xen-based hosting company:

  Ubuntu 10.04 LTS does not install out-of-the-box with default settings
  on (virtual) machine requiring pvgrub and it is necessary to manually
  adjust the 'groot=' setting in order to get the machine to boot.  Viz;

  "Ubuntu 10.04 LTS is now on the install menu (well, it has been for some
  time), however the bootloader install which works seamlessly on debian
  fails under Ubuntu, the following is what you need during the install to
  make it a bootable system:

  =========
  Ubuntu by default with guided partitioning uses ext4,
  which pvgrub won't understand, so don't choose "Guided -
  use entire disk", but choose "Guided - use entire disk
  and set up LVM", as this will make an ext2 /boot partition.

  Ubuntu will give a grub error when installing, you need to
  use the following workaround during the installation:
  When you get the grub error, choose continue, continue, execute a shell,
  continue
  chroot /target
  update-grub -y
  sed -i.orig 's:^# groot=.*:# groot=(hd0,0):' /boot/grub/menu.lst
  update-grub
  exit
  exit
  Continue without bootloader
  =========

  Some further information received:

  <..> sladen: the more root cause is grub installer not populating device.map
  <..> sladen: it doesn't seem to get bios devices for xvda devices

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