Public bug reported:
Well into a 14.04, upgrade grub-install failed, leaving the system
potentially unbootable. The error message is:
grub-install: warning: your core.img is unusually large. It won't fit in
the embedding area.
grub-install: error: embedding is not possible, but this is required for
RAID and LVM install.
A detail explanation of the problem is here:
http://ubuntuforums.org/showthread.php?t=2238233
In my limited understanding of the problem, the "embedding space" is the
space on /dev/sda before the fist partition. My partition table at
upgrade time was:
Device Boot Start End Blocks Id System
/dev/sda1 63 80324 40131 de Dell Utility
/dev/sda2 * 81920 27865087 13891584 7 HPFS/NTFS/exFAT
/dev/sda3 27865088 125521337 48828125 7 HPFS/NTFS/exFAT
/dev/sda4 125521918 3907028991 1890753537 5 Extended
/dev/sda5 3890290688 3907028991 8369152 82 Linux swap / Solaris
/dev/sda6 125521920 3890290687 1882384384 8e Linux LVM
where sda1..3 were pre-formatted images on a Dell desktop (the previous
Ubuntu version was installed after resizing sda3). I fixed the problem
by removing the unused sda1 partition and repeating grub-install.
I am opening this bug because I think the possibility that grub2 fails
install should be checked early in the upgrade process; upgrade
shouldn't start if there are the conditions to leave the machine
unbootable. Googling around lets me think this mode of failure is not so
uncommon (e.g. see https://bbs.archlinux.org/viewtopic.php?pid=1179691)
and should be addressed.
** Affects: grub-installer (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1354005
Title:
grub2 failes to install late in 14.04 upgrade process
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