lsb_release crashed with ImportError in <module>()

[Martin Erik Werner]

Binary package hint: lsb

During upgrade (apt-get upgrade), lsb_release crashed, meaning that when apport tried to collect the problem, it invoked lsb_release, which again crashed, and so on... Problem disappeared after upgrade was completed (which allowed sending this report).
Unfortunately it was 101 packages that was being upgrades, but I'm supplying relevant dpkg.log for reference.

ProblemType: Crash
Architecture: amd64
Date: Thu Jun 4 16:48:22 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/lsb_release
InterpreterPath: /usr/bin/python2.6
NonfreeKernelModules: nvidia
Package: lsb-release 4.0-0ubuntu1
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/lsb_release -sir
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.30-7.8-generic
PythonArgs: ['/usr/bin/lsb_release', '-sir']
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 2.6.30-7-generic x86_64
UserGroups:

[JMFTheVCI (jmfthevci)]

I also saw these messages during the install. Is it possible that these errors cause the re-introduction of https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/325973