package smokeping 2.6.7-1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1

james@BMCServer1:~$ lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04

james@BMCServer1:~$ apt-cache policy smokeping
smokeping:
  Installed: 2.6.7-1
  Candidate: 2.6.7-1
  Version table:
 *** 2.6.7-1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
        100 /var/lib/dpkg/status

Expected: disto upgrade from 11.10 to 12.4

During "do-release-upgrade" I was prompted to conform if I wanted to overwrite my smokeping config files with default ones from the package maintainer ("/etc/smokeping/config.d/", Targets, Probes, Presentation, General, "/etc/smokeping/basepage.html") . I selected No for each. After confirming for basepage.html, I received this output:

"
*** basepage.html (Y/I/N/O/D/Z) [default=N] ? n
Installing new version of config file /etc/init.d/smokeping ...
chown: invalid group: `smokeping:smokeping'
dpkg: error processing smokeping (--configure):
 subprocess installed post-installation script returned error exit status 1
No apport report written because MaxReports is reached already
                                                              Setting up dmsetup (2:1.02.48-4ubuntu7.1) ...
"

The result of an "id" shows that smokeping isn't in the group smokeping (and actually the smokeping group doesn't exist), this is not a change I've made to the server config:

james@BMCServer1:~$ id smokeping
uid=111(smokeping) gid=121(snmp) groups=121(snmp),33(www-data)

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: smokeping 2.6.7-1
ProcVersionSignature: Ubuntu 3.0.0-16.28-server 3.0.17
Uname: Linux 3.0.0-16-server x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Fri May 11 15:29:25 2012
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
PackageArchitecture: all
SourcePackage: smokeping
Title: package smokeping 2.6.7-1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2012-05-11 (0 days ago)