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To convert from the Flash video format found on sites like YouTube (fetch /get_video?video_id=... to get it), you can use ffmpeg like this:

ffmpeg input.flv -vcodec mpeg4 -acodec mp3 output.avi

Unfortunately, Ubuntu Breezy doesn't have the mpeg4 support compiled into ffmpeg. But it's really easy to do, and the lesson applies more generally. From the comments on this post:

sudo apt-get build-dep ffmpeg
sudo apt-get install liblame-dev libfaad2-dev libfaac-dev libxvidcore4-dev checkinstall fakeroot
DEB_BUILD_OPTIONS=risky fakeroot apt-get source ffmpeg --compile
sudo dpkg -i *.deb

[PS: most jargon-laden subject ever!]