I'm running Ubuntu 9.04 (64-bit), and I received the error after upgrading the following packages today: apport (0.143) to 0.144 apport-gtk (0.143) to 0.144 compiz-core (1:0.8.2-0ubuntu1) to 1:0.8.2-0ubuntu2 compiz-fusion-plugins-extra (0.7.9+git20090213-0ubuntu1) to 0.8.2-0ubuntu1 compiz-fusion-plugins-main (0.7.9+git20090213-0ubuntu2) to 0.8.2-0ubuntu1 compiz-plugins (1:0.8.2-0ubuntu1) to 1:0.8.2-0ubuntu2 compiz-wrapper (1:0.8.2-0ubuntu1) to 1:0.8.2-0ubuntu2 cups (1.3.9-14ubuntu2) to 1.3.9-15 cups-bsd (1.3.9-14ubuntu2) to 1.3.9-15 cups-client (1.3.9-14ubuntu2) to 1.3.9-15 cups-common (1.3.9-14ubuntu2) to 1.3.9-15 f-spot (0.5.0.3-1ubuntu2) to 0.5.0.3-1ubuntu4 gnome-applets (2.25.92-0ubuntu1) to 2.25.92-0ubuntu2 gnome-applets-data (2.25.92-0ubuntu1) to 2.25.92-0ubuntu2 gnome-applets-dbg (2.25.92-0ubuntu1) to 2.25.92-0ubuntu2 gnome-screensaver (2.24.0-0ubuntu4) to 2.24.0-0ubuntu5 gnome-settings-daemon (2.25.92-0ubuntu4) to 2.25.92-0ubuntu5 gvfs (1.1.7-0ubuntu1) to 1.1.8-0ubuntu1 gvfs-backends (1.1.7-0ubuntu1) to 1.1.8-0ubuntu1 gvfs-bin (1.1.7-0ubuntu1) to 1.1.8-0ubuntu1 gvfs-fuse (1.1.7-0ubuntu1) to 1.1.8-0ubuntu1 icedtea-6-jre-cacao (6b14-1.4.1-0ubuntu2) to 6b14-1.4.1-0ubuntu3 icedtea6-plugin (6b14-1.4.1-0ubuntu2) to 6b14-1.4.1-0ubuntu3 initramfs-tools (0.92bubuntu22) to 0.92bubuntu23 libavcodec-unstripped-52 (3:0.svn20090204-2ubuntu1+unstripped2) to 3:0.svn20090204-2ubuntu1+unstripped3 libavutil-unstripped-49 (3:0.svn20090204-2ubuntu1+unstripped2) to 3:0.svn20090204-2ubuntu1+unstripped3 libcups2 (1.3.9-14ubuntu2) to 1.3.9-15 libcupsimage2 (1.3.9-14ubuntu2) to 1.3.9-15 libdecoration0 (1:0.8.2-0ubuntu1) to 1:0.8.2-0ubuntu2 libdrm-intel1 (2.4.4-0ubuntu6) to 2.4.5-0ubuntu1 libdrm2 (2.4.4-0ubuntu6) to 2.4.5-0ubuntu1 libgalago1.0-cil (0.5.0-2.2) to 0.5.0-2.2ubuntu1 libgvfscommon0 (1.1.7-0ubuntu1) to 1.1.8-0ubuntu1 libpulse-browse0 (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 libpulse0 (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 libpulsecore9 (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 libpurple-bin (1:2.5.4-2ubuntu2) to 1:2.5.5-1ubuntu1 libpurple0 (1:2.5.4-2ubuntu2) to 1:2.5.5-1ubuntu1 libusplash0 (0.5.30) to 0.5.31 linux-firmware (1.9) to 1.10 module-init-tools (3.7~pre7-1) to 3.7~pre7-3 openjdk-6-jdk (6b14-1.4.1-0ubuntu2) to 6b14-1.4.1-0ubuntu3 openjdk-6-jre (6b14-1.4.1-0ubuntu2) to 6b14-1.4.1-0ubuntu3 openjdk-6-jre-headless (6b14-1.4.1-0ubuntu2) to 6b14-1.4.1-0ubuntu3 openjdk-6-jre-lib (6b14-1.4.1-0ubuntu2) to 6b14-1.4.1-0ubuntu3 pidgin (1:2.5.4-2ubuntu2) to 1:2.5.5-1ubuntu1 pidgin-data (1:2.5.4-2ubuntu2) to 1:2.5.5-1ubuntu1 pulseaudio (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 pulseaudio-esound-compat (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 pulseaudio-module-gconf (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 pulseaudio-module-hal (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 pulseaudio-module-x11 (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 pulseaudio-utils (0.9.14-0ubuntu10) to 0.9.14-0ubuntu11 python-apport (0.143) to 0.144 python-cupshelpers (1.1.3+git20090218-0ubuntu6) to 1.1.3+git20090218-0ubuntu7 python-problem-report (0.143) to 0.144 python3-minimal (3.0.1-0ubuntu2) to 3.0.1-0ubuntu3 sound-juicer (2.25.3-0ubuntu1) to 2.25.92-0ubuntu1 system-config-printer-common (1.1.3+git20090218-0ubuntu6) to 1.1.3+git20090218-0ubuntu7 system-config-printer-gnome (1.1.3+git20090218-0ubuntu6) to 1.1.3+git20090218-0ubuntu7 ubuntu-system-service (0.1.10) to 0.1.11 usplash (0.5.30) to 0.5.31