package mon (not installed) failed to install/upgrade: subprocess installed post-removal script returned error exit status 6

[Brad Cozine]

will try reinstall and subsequent removal

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: mon (not installed)
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu8
AptOrdering: mon: Purge
Architecture: amd64
Date: Fri Jul 6 04:17:14 2012
DpkgTerminalLog:
 Removing mon ...
 Purging configuration files for mon ...
 Removing user 'mon' ... userdel: user 'mon' does not exist
 dpkg: error processing mon (--purge):
  subprocess installed post-removal script returned error exit status 6
ErrorMessage: subprocess installed post-removal script returned error exit status 6
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: mon
Title: package mon (not installed) failed to install/upgrade: subprocess installed post-removal script returned error exit status 6
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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