package initramfs-tools 0.99ubuntu13 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1

[Montoriol]

upgrade pb from ubuntu 10.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: initramfs-tools
ProcVersionSignature: Ubuntu 3.2.0-35.55-generic 3.2.34
Uname: Linux 3.2.0-35-generic i686
ApportVersion: 2.0.1-0ubuntu15.1
Architecture: i386
Date: Sat Jan 5 14:37:57 2013
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 10.04.2 LTS "Lucid Lynx" - Release i386 (20110211.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: initramfs-tools
Title: package initramfs-tools 0.99ubuntu13 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2013-01-06 (0 days ago)

[Steve Langasek (vorlon)]

The casper package is a component of the livefs, and is not meant to be installed on an installed system. The casper initramfs hook has been fixed in the version of the package in 12.04, but at the time this error occurred you still had the 10.04 version of casper installed.