Sound Lost When Transferring from MPG to FLV

I have a problem that I am struggling to resolve. When I convert a video recorded using my Sony Camcorder from MPG to FLV, using FFMPEG, I lose the sound. I have done a little reading, and am currently struggling to fix this problem, but I think that is has something to do with some sound codecs not being installed. One one site I have read:

“By default flv selects mp3 audio but that is not configured in your
ffmpeg. Install lame, make distclean, add –enable-mp3lame to configure
command, make, retry. Some containers select default codecs that may not be
installed, and do so silently” – from mplayerhq.hu

So, looks like I need to install something, but what and how? Maybe there is something listed in the synaptic package manager that I can install……

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