lsb_release crashed with ImportError in <module>()

[Danilo]

Binary package hint: lsb

root@danilo-laptop:~# lsb_release -rd
Description: Ubuntu karmic (development branch)
Release: 9.10
root@danilo-laptop:~# apt-cache policy lsb
lsb:
  Installato: (nessuno)
  Candidato: 4.0-0ubuntu2
  Tabella versione:
     4.0-0ubuntu2 0
        500 http://archive.ubuntu.com karmic/main Packages

ProblemType: Crash
Architecture: i386
Date: Wed Jul 29 11:32:41 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/lsb_release
InterpreterPath: /usr/bin/python2.6
Package: lsb-release 4.0-0ubuntu2
PackageArchitecture: all
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/bin/lsb_release -is
ProcEnviron:
 PATH=(custom, user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-4.23-generic
PythonArgs: ['/usr/bin/lsb_release', '-is']
SourcePackage: lsb
Title: lsb_release crashed with ImportError in <module>()
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/lsb_release", line 26, in <module>
     import lsb_release
 ImportError: No module named lsb_release
Uname: Linux 2.6.31-4-generic i686
UserGroups: adm admin audio cdrom dialout dip fax fuse lpadmin netdev plugdev sambashare tape video