[Bug 972221] Re: error invalid blocklist, press any key to continue......

[linrunner]

sudo dpkg-reconfigure grub-pc

helped for me.

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https://bugs.launchpad.net/bugs/972221

Title:
  error invalid blocklist, press any key to continue......

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  I just had a daily update in Ubuntu 12.04, and during the update, ir
  gace an error saying it couldnt install the update and because of this
  you might not be able to boot from grub.......once I carried on, and
  rebooted, the grub appeared, you hit enter and that error appears

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