Managing a Kanotix hard disk installation
The result of a Debian-type hard disk installation of Kanotix is a Debian Sid (unstable) system.  There are different points of view as to whether 
apt-get upgrade or 
apt-get dist-upgrade should be used for upgrading a Sid system.
On the #kanotix channel, the favoured approach is to 
apt-get dist-upgrade relatively frequently:
Leave KDE and/or [Alt] + [Ctrl] + [F1] then login as root to carry out the following commands: 
# init 3
# apt-get update && apt-get dist-upgrade && apt-get clean
# fix-fonts.sh
# apt-get remove --purge lvm2 lvm-common
# dpkg-reconfigure kdm
# init 5 && exit
 
and you are done!
If you know what you are doing, you can do the following from an xterm to download the upgraded packages only for a later dist-upgrade from the console: 
# apt-get dist-upgrade -d
 
Recommended Reading
-> The 
APT-HOWTO∞
-> 
Apt/dpkg Tips∞ - Read and understand the APT-HOWTO before reading this.
See Also
-> 
The Alternative Approach describes another method.