package procps 1:3.2.8-11ubuntu6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Eric G. Stern]

this happened when I had my first unity desktop login after upgrading my system from 11.10 to 12.04.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: procps 1:3.2.8-11ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic x86_64
ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
Date: Tue Nov 13 10:15:57 2012
Df:
 Filesystem 1K-blocks Used Available Use% Mounted on
 /dev/sda6 223097628 35224728 176704644 17% /
 udev 1925944 196 1925748 1% /dev
 none 223097628 35224728 176704644 17% /run/lock
 none 223097628 35224728 176704644 17% /run/shm
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: procps
Title: package procps 1:3.2.8-11ubuntu6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2012-11-13 (0 days ago)

[Launchpad Janitor (janitor)]

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