you need to install the codecs. play one of the music file and it will ask you automatically.
now be in internet and download it and install it. basically ubuntu does it automatic if internet is there.
since ubuntu supports the free and open source software only mp3 and other proprietery format are not supported initially, so user have to broke the stop piracy rule by itself by downloading codec.
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Regards
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Mr. Sagar Kshetri (ASK?)
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www.sagarkshetri.com.np