Kanotix is a derivative of Debian. As is K/Ubuntu. As such, K/Ubuntu
can use Debian repositories as well.
I'm not saying Ubuntu's better. Just saying that it's also an offshoot
of Debian, hence the same repository access as others.
My brief experience with Ubuntu was that it may or may not work with
the Debian repositories. Trying to use Open Office from Sid on Breezy
was unpleasant, to say the least. The database and mailmerge were a
nightmare.
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http://distrowatch.com/dwres.php?resource=review-ubuntu>
Therefore, the most up-to-date Debian-based distros tend to be based
on Sid.
Despite the name, unstable does not mean that the operating system
or its applications are likely to crash. However, it does mean that
the package collection constantly changes. New packages are added and
old ones are kicked out on a daily basis. The best way to think of
unstable is that it's a moving target. This can cause problems when
you go to install new software - thus, distros based on unstable can
suffer from "package breakage", a serious disease that can lead to
hair loss (as well as a smashed computer monitor).
To solve this problem, once every six months Ubuntu syncs with
Debian's unstable package collection, but then goes its separate way.
Thus, as time passes, the two distros get out of sync. This has some
people concerned, among them, Ian Murdock, Debian's founder. In an
interview at InternetNews.com, Ian pulled no punches:
"If anything, Ubuntu's popularity is a net negative for Debian. It's
diverged so far from Sarge that packages built for Ubuntu often don't
work on Sarge. And given the momentum behind Ubuntu, more and more
packages are being built like this. The result is a potential
compatibility nightmare."
Ian's main concern is that Ubuntu is not truly Debian compatible,
and that development efforts are being sapped as everyone concentrates
on Ubuntu. Contributing to the controversy is the fact that Ubuntu is
not a member of the Debian Common Core (DCC) Alliance. In the true
tradition of online discourse, this has generated some significant
flame wars.