Failed to install tomboy 1.6.1-0ubuntu1 - /usr/share/gconf/schemas/tomboy.schemas:1: parser error : Document is empty

Binary package hint: tomboy

$ sudo apt-get install tomboy
Reading package lists... Done
Building dependency tree
Reading state information... Done
tomboy is already the newest version.
The following packages were automatically installed and are no longer required:
  python-gtk2-dev python-gtk2-doc libnm-glib-vpn1 libgcj-bc libppl7 linux-headers-2.6.38-8 libftgl2 libglade2-dev docbook-xsl libffi-dev libgcj11 libppl-c2 libavfilter1
  linux-headers-2.6.38-8-generic libedata-cal1.2-10 libedata-book1.2-8 gcj-4.5-jre-lib libytnef0 python-gobject-dev gcj-4.5-base libavdevice52
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]?
Setting up gconf2 (2.32.3-1ubuntu1) ...
WARNING: Failed to parse default value `' for schema (/schemas/apps/devhelp/state/main/contents/books_disabled)
/usr/share/gconf/schemas/tomboy.schemas:1: parser error : Document is empty

^
/usr/share/gconf/schemas/tomboy.schemas:1: parser error : Start tag expected, '<' not found

^
dpkg: error processing gconf2 (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of tomboy:
 tomboy depends on gconf2 (>= 2.28.1-2); however:
  Package gconf2 is not configured yet.
dpkg: error processing tomboy (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while processing:
 gconf2
 tomboy
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: tomboy 1.6.1-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Thu May 19 19:24:03 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 LANGUAGE=it_IT:en_GB:en
 PATH=(custom, user)
 LANG=C
 SHELL=/bin/bash
SourcePackage: tomboy
UpgradeStatus: Upgraded to oneiric on 2010-12-06 (164 days ago)