[Bug 1491894] Re: lucid to precise to trusty upgrade may leave system unbootable

[Louis Bouchard]

First proposition of fix for discussion

** Patch added: "lp1491894_fix_lucid_debconf_empty.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1491894/+attachment/4461329/+files/lp1491894_fix_lucid_debconf_empty.debdiff

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https://bugs.launchpad.net/bugs/1491894

Title:
  lucid to precise to trusty upgrade may leave system unbootable

Status in grub2 package in Ubuntu:
  In Progress
Status in grub2 source package in Trusty:
  In Progress

Bug description:
  A system, initially installed on 10.04 Lucid then upgraded to 12.04
  precise, when upgraded to Trusty may not reboot following the end of
  the do-release-upgrade command.

  Reproduction steps
  ==================

  Install a VM with 10.04.4-server ISO. When booted in 10.04, issue :

  $ sudo do-release-upgrade           # to 12.04 precise

  Then let the system upgrade and reboot.

  $ sudo do-release-upgrade           # to 14.04 trusty

  Then let the system upgrade and reboot

  Upon reboot, the system will display a blank screen with a prompt and
  will not reboot.

  Workaround
  ==========

  Force a reconfiguration of the grub-pc package :
  $ sudo dpkg-reconfigure grub-pc

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