Public bug reported:
I have several ubuntu 12.04 systems. On testing some of them to upgrade
to 14.04, a few of them fail.
All the systems where updated to the moment before the trusty upgrade,
so they where running 12.04.04 at upgrade time.
The ones that work file, seem to be installed recently. Installs from
like 12.04.02 or later, maybe 12.04.01 also, but not sure.
The older ones, fail after the first reboot, grub hangs with a blinking
curser. The Loading Grub appears and vanishs almost instantly, and grub
refuses to display the menu.
If I boot a recovery cd, and manually re-install grub to the harddrive,
using install-grub /dev/sda, there is no more failures.
So it appears on systems that don't have a new enough grub bootloader
code, the upgrade fails to upgrade it, making the system unbootable.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1300346
Title:
Upgrade from Precise fails to boot
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