~ubuntu-branches/ubuntu/natty/app-install-data-ubuntu/natty-proposed

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Channels are a general concept to for a source of software.
Each channel consists of a sources.list fragment that can
be copied into the sources.list.d dir. It must be nammed 
"$channelname.list". It should have a matching channel authentication
key as well. The key is called "$channelname.key".