debian apt packages hash sum mismatch

Question

From the Debian command line, I'm getting a hash sum mismatch after executing aptitude update; aptitude upgrade. Below is the command line output. I've tried an aptitude clean, but this does not seem to help. I've also done a few google searches, but nothing seems to help. I've been getting the mismatch error for a few days.

Any help is appreciated.

---

Resolving dependencies...
open: 405; closed: 880; defer: 58; conflict: 78.
The following packages will be upgraded:
  apache2.2-bin apt-utils aptdaemon aptdaemon-data avahi-daemon bind9-host dnsutils ekiga gir1.2-cogl-1.0 gir1.2-coglpango-1.0 gstreamer0.10-alsa gstreamer0.10-ffmpeg
  gstreamer0.10-plugins-base gstreamer0.10-x host libapt-inst1.5 libavahi-client3 libavahi-common-data libavahi-common3 libavahi-core7 libavahi-glib1 libavahi-gobject0
  libavahi-ui-gtk3-0 libavahi-ui0 libavutil51 libbind9-80 libcapi20-3 libcogl-common libcogl9 libdbus-glib-1-2 libdns88 libgconf2.0-cil libgssapi-krb5-2 libgssrpc4
  libgstreamer-plugins-base0.10-0 libisc84 libisccc80 libisccfg82 libk5crypto3 libkrb5-3 libkrb5support0 liblwres80 libmp3lame0 libmtp-common libmtp-runtime libmtp9
  libpostproc52 libruby1.8 libswscale2 libsystemd-login0 libtag1-vanilla libtag1c2a libxml2 libxml2-utils linux-headers-3.2.0-4-686-pae linux-headers-3.2.0-4-common
  linux-image-3.2.0-4-686-pae linux-libc-dev linux-source-3.2 python-aptdaemon python-aptdaemon-gtk python-aptdaemon.gtk3widgets python-aptdaemon.gtkwidgets
  python-libxml2 python-numpy ruby1.8 telepathy-gabble unattended-upgrades xserver-xorg-video-ati xserver-xorg-video-radeon
The following packages are RECOMMENDED but will NOT be installed:
  krb5-locales
70 packages upgraded, 0 newly installed, 0 to remove and 168 not upgraded.
Need to get 4322 kB/136 MB of archives. After unpacking 7982 kB will be used.
Do you want to continue? [Y/n/?]
Get: 1 http://www.deb-multimedia.org/ testing/main libavutil51 i386 8:1.0.5-dmo1 [111 kB]
Get: 2 http://www.deb-multimedia.org/ testing/main libmp3lame0 i386 1:3.99.5-dmo2 [338 kB]
Get: 3 http://www.deb-multimedia.org/ testing/main libpostproc52 i386 8:1.0.5-dmo1 [79.6 kB]
Get: 4 http://www.deb-multimedia.org/ testing/main libswscale2 i386 8:1.0.5-dmo1 [126 kB]
Get: 5 http://www.deb-multimedia.org/ testing/main libtag1-vanilla i386 1.8-dmo1 [257 kB]
Get: 6 http://www.deb-multimedia.org/ testing/main libtag1c2a i386 1.8-dmo1 [9396 B]
Get: 7 http://www.deb-multimedia.org/ testing/main gstreamer0.10-ffmpeg i386 1:0.10.13-dmo1 [3402 kB]
Fetched 4322 kB in 35s (121 kB/s)                                                                                                                                                
E: Failed to fetch http://www.deb-multimedia.org/pool/main/f/ffmpeg-dmo/libavutil51_1.0.5-dmo1_i386.deb: Hash Sum mismatch
E: Unable to correct for unavailable packages

Answer 1

Try using apt-get:

apt-get clean
rm -rf /var/lib/apt/lists/*
apt-get clean
apt-get update
apt-get upgrade