package grub-pc 1.99-12ubuntu5 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 20

[Shash]

This same package refused to install or upgrade when I upgraded my system to 11.04/ It was an in complete upgrade because of this package, but it did somehow succeed. After restarting, I went to the update center to update my packages. It asked me to do a partial upgrade because of some error. This time too, this package refused to install or upgrade!

ProblemType: Package
DistroRelease: Ubuntu 11.10
Package: grub-pc 1.99-12ubuntu5
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Thu Oct 20 15:27:05 2011
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 20
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: grub2
Title: package grub-pc 1.99-12ubuntu5 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 20
UpgradeStatus: Upgraded to oneiric on 2011-10-20 (0 days ago)

[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.]