package apt 0.9.9.1~ubuntu3.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

[selcii]

what can I do?

ProblemType: Package
DistroRelease: Ubuntu 13.10
Package: apt 0.9.9.1~ubuntu3.2
ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
Uname: Linux 3.11.0-19-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: i386
Date: Sat Jul 19 08:45:21 2014
DuplicateSignature: package:apt:0.9.9.1~ubuntu3.2:subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationDate: Installed on 2013-11-02 (258 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
MarkForUpload: True
SourcePackage: apt
Title: package apt 0.9.9.1~ubuntu3.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)