unknown media type when installing package

When installing the recent nautilus update, the following text appeared as it was installing:

Unpacking replacement nautilus ...
Processing triggers for hicolor-icon-theme ...
Processing triggers for shared-mime-info ...
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'
Unknown media type in type 'uri/mms'
Unknown media type in type 'uri/mmst'
Unknown media type in type 'uri/mmsu'
Unknown media type in type 'uri/pnm'
Unknown media type in type 'uri/rtspt'
Unknown media type in type 'uri/rtspu'
Unknown media type in type 'interface/x-winamp-skin'

I interpret this text as an error in the package install script.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: nautilus 1:3.2.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Wed Oct 26 15:41:45 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_GB
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (11 days ago)