cron breaks dpkg-reconfigure -a

[PeterPall]

Binary package hint: cron

Hello, there,

If I start a terminal and type in the following command:
sudo dpkg-reconfigure -plow cron

I get the following reply:
stop: Unknown instance:
dpkg-maintscript-helper: error: couldn't identify the package

This is bad since it makes the following command abort prematurely:
dpkg-reconfigure -a

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: cron 3.0pl1-115ubuntu1
ProcVersionSignature: Ubuntu 2.6.37-11.25-generic 2.6.37-rc7
Uname: Linux 2.6.37-11-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Sat Dec 25 01:35:10 2010
EcryptfsInUse: Yes
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LC_MESSAGES=en_US.utf8
 SHELL=/bin/bash
SourcePackage: cron

[Christian Kastner (ckk)]

This has been reported and confirmed as a debconf issue in Debian, see: http://bugs.debian.org/560317