I am running  Ubuntu on a Lenovo  G770 laptop.  I left the original
Lenovo Win 7 config on the HDD (it's the only Windows boot image I have
left and I need it for contingency) -- albeit with a minimal pair of
partitions and configured dual boot pretty much as per the Trusty guide
though I did this back with 12.10.  I have upgraded Ubuntu 8 times, 3 on
this laptop, and this has been my only fail.  I use a standard grub-pc
install, and am a reasonably experienced sysadmin and developer.

@psusi, I won't bother enumerating all the false tries, and cascade
failures.  The underlying failure appears to be that the upgrade process
*silently* failed to install the new 2.02-beta2-9 MBR loader on my HDD,
and as you described above, the root failure was that the MBR and /boot
grub2 components were out of sync.  Given that part 0 starts at a block
2K block rather than block 39,  there is no reason why this MBR
bootstrap installation should have failed.  So a simple sudo grub-
install /dev/sda fixed this, and now both images are booting cleanly.

Some general comments:

*  LTS releases are supposed to be *stable*.  Why are we rolling out a
"beta2-9" version of anything? Especially if anything goes wrong it will
render the entire system unbootable; and the fix requires intimate
sysadmin knowledge so is not really user-workable.

*  As others have said, any upgrade process which can leave a
significant percentage of users system unusable is badly specified /
implemented. This sort of bug is "Critical", IMO and not "High".  At a
minimum the  upgrade process should carry out the necessary validation
checks *before* starting the upgrade and abort with an informational
error if there is going to be a failure.

*  The https://wiki.ubuntu.com/TrustyTahr/ReleaseNotes#Known_issues page
does not list this.  It should.

*  The user comments in this bugrep include a lot of misleading chaff.
A clearly defined diagnostic process and recovery process should be
documented by the release team and referenced in the this known issues
section.

Blaming the users for this happening is a mistake.  Mistakes happen both
by users and in development. The main goal here should be to move
forward in a positive manner, and to minimise the total impact.

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https://bugs.launchpad.net/bugs/1289977

Title:
  Ubuntu 14.04 Update breaks grub, resulting in "error: symbol
  'grub_term_highlight_color' not found"

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