package unattended-upgrades 0.82.1ubuntu2.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 255

[SKMEDi]

Nothing

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: unattended-upgrades 0.82.1ubuntu2.1
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: i386
Date: Tue Mar 10 08:13:59 2015
DuplicateSignature: package:unattended-upgrades:0.82.1ubuntu2.1:subprocess installed post-installation script returned error exit status 255
ErrorMessage: subprocess installed post-installation script returned error exit status 255
InstallationDate: Installed on 2014-08-15 (206 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
PackageArchitecture: all
SourcePackage: unattended-upgrades
Title: package unattended-upgrades 0.82.1ubuntu2.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 255
UpgradeStatus: No upgrade log present (probably fresh install)