backtrack 4

Funny, when you google it, these are first 2 results:

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DistroWatch.com: BackTrack
BackTrack is an Ubuntu-based distribution with a collection of security and forensics tools. ... 2009-06-20: Development Release: BackTrack 4 Pre-Final ...
distrowatch.com/backtrack - Cached
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Download BackTrack 3.0 / 4.0 Pre-Final for Linux - BackTrack is a ...
Jun 21, 2009 ... BackTrack BackTrack is a Slackware and SLAX-based live CD with a collection of security and forensics tools.
linux.softpedia.com/get/System/Operating.../BackTrack-9477.shtml - Cached

One says Ubuntu one says Slax. But Distrowatch says Ubuntu. I guess they didn't change their /etc/lsb-version or whatever folder they're using for their distro ID. This is not usual just sloppy. It doesn't really matter to the running of backtrack, and, btw, it's still pre-final so it's not all polished yet.

Edit: Pre-Final June 21, 2009 and no final yet? Hmmm.