I can't update my Debian Sid system.on running the apt-get upgrade I am getting:maciej@wladyslawa:/etc/apt$ sudo apt-get upgradeReading package lists... DoneBuilding dependency tree       Reading state information... DoneThe following packages have been kept back:  gnome-keyring libglx-nvidia-alternativesThe following packages will be upgraded:  antlr apt-listchanges bluez ca-certificates-java cron dbus dbus-x11 debianutils  dictionaries-common grep grub-common grub-pc grub-pc-bin grub2-common gstreamer0.10-packagekit  icedtea-6-jre-cacao inkscape iso-codes libantlr-java libantlr-java-gcj libatlas3gf-base  libbluetooth3 libdbus-1-3 libdbus-1-dev libdbus-glib-1-2 libdbus-glib-1-dev libdjvulibre-text  libdjvulibre21 libgc1c2 libgck0 libgcr-3-0 libgl1-mesa-dev libgl1-mesa-dri libgl1-mesa-glx  libglu1-mesa libglu1-mesa-dev libgnome-keyring0 libnm-glib-vpn1 libnm-glib2 libnm-util1  libogre-dev libogremain-1.7.1 libpackagekit-glib2-14 libpam-gnome-keyring libpipeline1 libsrtp0  mesa-common-dev module-init-tools network-manager network-manager-dev ogre-tools openjdk-6-jdk  openjdk-6-jre openjdk-6-jre-headless openjdk-6-jre-lib packagekit packagekit-backend-aptcc  python-glade2 python-gtk2 python-gtksourceview2 python-openssl python-packagekit rsyslog  x11proto-resource-dev xserver-common xserver-xephyr xserver-xorg-core xserver-xorg-dev68 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.Need to get 1,571 kB/121 MB of archives.After this operation, 2,249 kB of additional disk space will be used.Do you want to continue [Y/n]? yErr http://debian.man.ac.uk/debian/ sid/main gstreamer0.10-packagekit i386 0.6.14-2  404  Not FoundErr http://debian.man.ac.uk/debian/ sid/main packagekit-backend-aptcc i386 0.6.14-2  404  Not FoundErr http://debian.man.ac.uk/debian/ sid/main packagekit i386 0.6.14-2  404  Not FoundErr http://debian.man.ac.uk/debian/ sid/main python-packagekit all 0.6.14-2  404  Not FoundErr http://debian.man.ac.uk/debian/ sid/main libpackagekit-glib2-14 i386 0.6.14-2  404  Not FoundErr http://debian.man.ac.uk/debian/ sid/main libsrtp0 i386 1.4.4+20100615~dfsg-1  404  Not FoundFailed to fetch http://debian.man.ac.uk/debian/pool/main/p/packagekit/gstreamer0.10-packagekit_0.6.14-2_i386.deb  404  Not FoundFailed to fetch http://debian.man.ac.uk/debian/pool/main/p/packagekit/packagekit-backend-aptcc_0.6.14-2_i386.deb  404  Not FoundFailed to fetch http://debian.man.ac.uk/debian/pool/main/p/packagekit/packagekit_0.6.14-2_i386.deb  404  Not FoundFailed to fetch http://debian.man.ac.uk/debian/pool/main/p/packagekit/python-packagekit_0.6.14-2_all.deb  404  Not FoundFailed to fetch http://debian.man.ac.uk/debian/pool/main/p/packagekit/libpackagekit-glib2-14_0.6.14-2_i386.deb  404  Not FoundFailed to fetch http://debian.man.ac.uk/debian/pool/main/s/srtp/libsrtp0_1.4.4+20100615~dfsg-1_i386.deb  404  Not FoundE: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?I did try both apt-get update --fix-missing and apt-get install -fbut that didn't help much.Here is my source.list file:deb http://debian.man.ac.uk/debian/ sid main contrib non-free deb-src http://debian.man.ac.uk/debian/ sid main contrib non-free Does anybody have any idea how can I sort it out?
Problems with apt-get upgrade on Debian (404 Not Found)
debian;apt;upgrade;dependencies
That mirror is in an inconsistent state: it has packagekit 0.6.14-2 in the package index, but the file pool only has an earlier version.The situation will resolve itself naturally, when the mirror gets its next update. (Most mirrors are updated daily.) In the meantime, you can use another mirror.If this happens often (or at all), it may indicate that the mirror is not set up properly  there are instructions for setting up a mirror, and they're supposed to minimize the window of time when a mirror is in an inconsistent state. Please note that this paragraph is pure speculation, I don't actually know whether the mirror is misconfigured or this is just unavoidable bad luck.