Parece muito errado para mim.
sudo apt-get install ubuntu-restricted-extras
mostra-me ...
Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: gstreamer0.10-plugins-bad-multiverse libavcodec-extra-53 libavutil-extra-51 libfaac0 libmjpegtools-1.9 libopenjpeg2 libquicktime2 Suggested packages: libfaad0 The following packages will be REMOVED: libavcodec53 libavutil51 The following NEW packages will be installed: gstreamer0.10-plugins-bad-multiverse libavcodec-extra-53 libavutil-extra-51 libfaac0 libmjpegtools-1.9 libopenjpeg2 libquicktime2 ubuntu-restricted-extras 0 upgraded, 8 newly installed, 2 to remove and 0 not upgraded. Need to get 6,733 kB of archives. After this operation, 2,217 kB of additional disk space will be used. Do you want to continue [Y/n]?
Isso parece mais com uma quantidade correta de pacotes.
Esta é a parte que você precisa corrigir primeiro:
The following packages have unmet dependencies:
libavutil-extra-51 : Conflicts: libavutil51 but 4:0.8.1-0ubuntu1 is installed.
libavcodec-extra-53 : Conflicts: libavcodec53 but 4:0.8.1-0ubuntu1 is installed.
e esses pacotes desaparecerão da lista.