Regarding the suggestion in #2:

> Then running run 'dpkg-reconfigure grub-pc' and make sure that all of the 
> disks on your 
> system are selected but none of the  partitions, unless you know better.

If I just run this command, I don't get to select or deselect any
partitions or disks - I'm just asked about the "Linux command line"
(shown as empty by default) and "Linux parameters for the default menu
entry but not for the recovery mode" (shown as "quiet splash" by
default).  So I was not sure what I should do to follow the
recommendation of selecting all disks but none of the partitions.  Just
running "dpkg-reconfigure grub-pc" and accepting the defaults did *not*
make my Ubuntu installation bootable.

I then tried the following sequence of commands (/dev/sda6 being the
partition where I had Ubuntu installed) and it did make my Ubuntu
partition bootable:

  mount /dev/sda6 /mnt
  mount --bind /proc /mnt/proc
  mount --bind /dev /mnt/dev
  mount --bind /sys /mnt/sys
  chroot /mnt
  update-grub
  grub-install /dev/sda
  exit
  umount /mnt/sys /mnt/dev /mnt/proc /mnt
  reboot

After I did this and got my Ubuntu bootable, I tried "dpkg-reconfigure
grub-pc" again, and now I *did* get questions about what
disks/partitions I wanted to install grub2 to.  I also got some progress
information in the terminal window I did not get before, so it seems the
original attempt aborted prematurely somehow (but without leaving any
kind of error message).

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https://bugs.launchpad.net/bugs/756564

Title:
  After Maverick to Natty upgrade, grub won't boot and displays "symbol
  not found : 'grub_env_export'"

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