How do I install application plugins offline in Ubuntu?

Subas Acharya August 12, 2012
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I am completely new to Linux systems and just installed Ubuntu 12.04 in my laptop. I can’t access internet from it because it doesn’t recognize my USB modem (used with data sim).
When I try to play mp3 songs in Rythmbox it displays message, “Required plugin could not be found – python (v 2.7) requires to install plugins to play media files of the following type: MPEG-1 Layer 3 (mp3) decoder.”

I’ve downloaded gst-ffmpeg-0.10.2.tar and i don’t know how to install it. Help me install it in the easiest way please.

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