I'm trying to install mythtv on a HDD install of Knoppix, but get the following error:

W: Couldn't stat source package list http://www.penguinppc.org ./ Packages (/var/lib/apt/lists/www.penguinppc.org_%7edaniels_sid_i386_._Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Sub-process /usr/bin/dpkg returned an error code (1)

apt-get update gives a similar problem. Can someone help with a solution?
Thanks
usbrit