This bug was fixed in the package grub2 - 1.99-21ubuntu3.18
--------------- grub2 (1.99-21ubuntu3.18) precise; urgency=medium
* Do not hang headless servers indefinitely on boot after edge case power failure timing (LP: #1443735). Instead, time out after 30 seconds and boot anyway, including on non-headless systems.
-- Robie Basak <email address hidden> Tue, 19 May 2015 12:22:34 +0100
This bug was fixed in the package grub2 - 1.99-21ubuntu3.18
---------------
grub2 (1.99-21ubuntu3.18) precise; urgency=medium
* Do not hang headless servers indefinitely on boot after edge case power
failure timing (LP: #1443735). Instead, time out after 30 seconds and boot
anyway, including on non-headless systems.
-- Robie Basak <email address hidden> Tue, 19 May 2015 12:22:34 +0100