[declan@chilidog ~]$ sudo pacman -Syu
:: Synchronizing package databases...
 testing is up to date
 core is up to date
 extra is up to date
 community is up to date
 archlinuxfr is up to date
:: Starting full system upgrade...
warning: kdelibs: local (4.7.3-2) is newer than extra (4.7.3-1)
warning: qt: local (4.8.0rc1-1) is newer than extra (4.7.4-3)
resolving dependencies...
looking for inter-conflicts...

Targets (65): avrdude-5.11.1-1  binutils-2.22-2  boost-libs-1.48.0-2  colord-0.1.15-3  convertlit-1.8-6  djvulibre-3.5.24-2  ethtool-1:3.1-1  fakeroot-1.18.2-1  gcc-4.6.2-3  gcc-libs-4.6.2-3  glibc-2.14.1-2
              graphviz-2.28.0-6  gstreamer0.10-bad-0.10.22-3  gstreamer0.10-bad-plugins-0.10.22-3  gtk3-3.2.2-3  jack-0.121.3-4  keyutils-1.5.5-1  lame-3.99.3-1  lesstif-0.95.2-4  libdvdnav-4.2.0-1
              libdvdread-4.2.0-1  libgusb-0.1.3-1  libiec61883-1.2.0-3  libmatroska-1.3.0-2  libtorrent-rasterbar-0.15.9-1  libvdpau-0.4.1-2  libxrandr-1.3.2-2  linux-3.1.4-1  linux-api-headers-3.1.4-1
              linux-headers-3.1.4-1  minicom-2.5-3  mjpegtools-2.0.0-1  mkinitcpio-0.8.0-3  module-init-tools-3.16-3  mtr-0.82-1  parted-3.0-4  pm-quirks-0.20100619-2  polkit-0.103-1  python-chardet-2.0.1-5
              python2-chardet-2.0.1-5  python2-zope-interface-3.8.0-1  raptor-2.0.6-1  redland-1:1.0.15-1  redland-storage-virtuoso-1:1.0.15-1  rxvt-unicode-9.12-2  scrot-0.8-5  shadow-4.1.4.3-5
              shared-color-profiles-0.1.5-1  shared-desktop-ontologies-0.8.1-1  startup-notification-0.12-2  strace-4.6-2  syslog-ng-3.3.3-1  texlive-bin-2011.2-1  texlive-core-2011.24722-1
              texlive-latexextra-2011.24718-1  texlive-pstricks-2011.24695-1  texlive-publishers-2011.24723-1  transcode-1.1.7-1  upower-0.9.15-1  vim-7.3.353-2  vim-runtime-7.3.353-2  vlc-1.1.12-5
              xcb-util-0.3.8-1  xcb-util-keysyms-0.3.8-1  xine-ui-0.99.6-3

Total Installed Size:   826.95 MiB
Net Upgrade Size:       35.59 MiB

Proceed with installation? [Y/n] y
(65/65) checking package integrity                                                                                             [############################################################################] 100%
error: gtk3: signature from "Ionut Biru <ibiru@archlinux.org>" is invalid
error: failed to commit transaction (invalid or corrupted package)
Errors occurred, no packages were upgraded.