Deja-Dup stops with unknown error

[BeowulfOF]

Binary package hint: deja-dup

beowulf@stormrider:~$ lsb_release -rd
Description: Ubuntu 10.04 LTS
Release: 10.04
beowulf@stormrider:~$ apt-cache policy deja-dup
deja-dup:
  Installiert: 14.0.3-0ubuntu1
  Kandidat: 14.0.3-0ubuntu1
  Versions-Tabelle:
 *** 14.0.3-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ lucid/universe Packages
        100 /var/lib/dpkg/status

Command line output of deja-dup:
beowulf@stormrider:~$ deja-dup

(deja-dup:2632): GLib-GIO-CRITICAL **: g_file_get_uri: assertion `G_IS_FILE (file)' failed

** (deja-dup:2632): CRITICAL **: deja_dup_duplicity_cmp_prefix: assertion `b != NULL' failed *[This line appears 60 times]*

** (deja-dup:2632): DEBUG: DuplicityInstance.vala:199: Running the following duplicity (2636) command: duplicity collection-status --exclude=*[longlistofexcludes]* --gio

** (deja-dup:2632): DEBUG: DuplicityInstance.vala:552: duplicity (2636) exited with value 2

Simply deja-dup does not work.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: deja-dup 14.0.3-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
Architecture: i386
Date: Sat May 1 08:13:13 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.utf8
 SHELL=/bin/bash
SourcePackage: deja-dup