i did the hd install for knoppix 3.8

i like it.

i want to install the kernel source tree, so i can compile my own stuff.

i'm doing a apt-get update
now an apt-get -u upgrade

how do i get the kernel source tree? and is there some sort of list someplace i can look at to pick and choose what i want to install?

hey, i thank you in advance!

harold