after installing knoppix 3.7 on hdd i tried to use apt-get but nothing happend for example
root@box:/home/waelali# apt-get upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

then i tried to install kaffeine or freecraft(game) this was the answer

root@box:/home/waelali# apt-get install freecraft
Reading Package Lists... Done
Building Dependency Tree... Done
E: Couldn't find package freecraft


root@box:/home/waelali# apt-get install kaffeine
Reading Package Lists... Done
Building Dependency Tree... Done
E: Couldn't find package kaffeine