Possible Duplicate:
How to convert a Video to MP3?
I am using 12.04 . I have found a question that have the solution
How can I convert audio from MP4 or FLV video files to mp3?
But when i tried the answer i got this problem .
subbu@subbu-300E4Z-300E5Z-300E7Z:~$ sudo apt-get install ffmpeg libavcodec-unstripped-52.
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libavcodec-unstripped-52.
E: Couldn't find any package by regex 'libavcodec-unstripped-52.'