Install Extra Codecs (MP3/WMV, etc)

MP3, WMV format does not work on Ubuntu's default installation.

To enable those, follow this guide

http://ubuntuguide.org/wiki/Ubuntu_Edgy#How_to_install_Multimedia_Codecs

sudo apt-get install gstreamer0.10-ffmpeg gstreamer0.10-gl gstreamer0.10-plugins-base \
gstreamer0.10-plugins-good gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multiverse \
gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-multiverse libxine-extracodecs w32codecs 

If WMV still not working, try this

https://help.ubuntu.com/community/RestrictedFormats#head-6c942d1939d97331f96e42b63774003fde7daed5

wget -c http://www.debian-multimedia.org/pool/main/w/w32codecs/w32codecs_20061022-0.0_i386.deb
sudo dpkg -i w32codecs_20061022-0.0_i386.deb

If still not working, try this

http://ubuntuforums.org/showthread.php?p=1649012

rm -rf ~/.gstreamer-0.10
gst-inspect-0.10

Finally worked for me when I finished the last step.