full linux means that your going to flash the tsop or a modhcip and format the entire drive.
if you want to tsop, then you need a non 1.6 xbox. if you have a 1.6, you either have to keep it softmodded or chip it. in this case you need to do a native "F" install.
once you have it flashed with cromwell, then you need a live cd to install your distro. there are many choices to choose (xebian, gentoox, xdsl are the top three.) if you want a useable desktop computer, i would go with xdsl,but if you want an easy to set up server, go with gentoox (its weird, the gentoox website seems down right now, and finally, if you want linux on the xbox for another reason xebian might be your choice because its is debian based. a note, with all distros it is posible to do a "full" native install, but only xebian has it built in its installer. others will require you to edit some install scripts, then rebuilding the installer disc. here are guides
XDSL
http://x-dsl.org/wik..._native_installGentoox
http://forums.shalla....php?f=5&t=3092also, you can install more than one distro just like on a regular computer, but you will need to have an understanding of partitioning and the install scripts.
once you get a distro of choice, choose a native install. remember, you can only do the full native install if you flashed the chip/tsop. so you cannot do it with a 1.6.
then you will have linux. if you have the 1.6 you will need xromwell xbe. this is the same thing as cromwell bios, just in xbe format. so once you get your softmod working and launching linux as an app, you can replace the dashboards "default.xbe" with xromwel xbe. then you xbox will bott straight to linux.