1.5.41ubuntu2 : dpkg-maintscript-helper: error: couldn't identify the package

[dino99]

Precise i386 , logged as gnome-classic (without effects)

Get this output when run :

oem@oem-desktop:~$ sudo dpkg-reconfigure apparmor
[sudo] password for oem:
dpkg-maintscript-helper: error: couldn't identify the package
oem@oem-desktop:~$ sudo dpkg-maintscript-helper
[sudo] password for oem:
Usage: dpkg-maintscript-helper <command> <parameter>... -- <maintainer-script-parameter>...

Commands:
  supports <command>
 Returns 0 (success) if the given command is supported, 1 otherwise.
  rm_conffile <conffile> [<last-version> [<package>]]
 Remove obsolete conffile. Must be called in preinst, postinst and
 postrm.
  mv_conffile <old-conf> <new-conf> [<last-version> [<package>]]
 Rename a conffile. Must be called in preinst, postinst and postrm.
  help
 Display this usage information.

So it seem an error with dpkg-reconfigure

Similar report on Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=636560

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: debconf 1.5.41ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic-pae 3.2.6
Uname: Linux 3.2.0-17-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.92-0ubuntu1
Architecture: i386
Date: Tue Feb 21 09:55:57 2012
PackageArchitecture: all
SourcePackage: debconf
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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