package grub-pc 2.02~beta2-9ubuntu1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 64

[Duncan]

Upgrading from 12.04 to 14.04 upgrade fails near end with grub issue - details attached

package grub-pc 2.02~beta2-9ubuntu1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 64

I was expecting the upgrade to be reasonably straight forward

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: grub-pc 2.02~beta2-9ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-52.78-generic 3.2.48
Uname: Linux 3.2.0-52-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
Date: Sun Jul 27 14:28:47 2014
DuplicateSignature: package:grub-pc:2.02~beta2-9ubuntu1:ErrorMessage: subprocess installed post-installation script returned error exit status 64
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 64
InstallationDate: Installed on 2011-07-23 (1099 days ago)
InstallationMedia: Ubuntu-Server 11.04 "Natty Narwhal" - Release amd64 (20110426)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-52-generic root=UUID=d87ab46d-8f10-4452-8aa1-d3f3d720d09a ro quiet
SourcePackage: grub2
Title: package grub-pc 2.02~beta2-9ubuntu1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 64
UpgradeStatus: Upgraded to trusty on 2014-07-27 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for grub2 (Ubuntu) because there has been no activity for 60 days.]