On 5/7/2012 3:28 PM, Steve Langasek wrote:
> This has never been the case because we don't believe we have a reliable
> enough way to identify the correct device to write to.

It has been the case for some time now.  We use debconf to store the 
devices that need grub reinstalled on upgrade.  You can run 
dpkg-reconfigure grub-pc to update/correct the list.

> Regardless, this is not behavior that it's reasonable to change in an SRU.
> We need to fix the grub.cfg to be compatible with lucid grub.

If you upgrade to precise, you should no longer be running the precise 
grub, not lucid grub.  The grub ABI is not stable, so whenever a new 
grub package is installed, the MBR/core image must also be updated or 
breakage will happen when it tries to use the updated modules in 
/boot/grub.  The same rationale applies to the config file.

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https://bugs.launchpad.net/bugs/978464

Title:
  Upgrade 10.04 to 12.04 Beta 2 failed, grub issue

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