Re: PowerPC 8500??
To begin with, I must say that this is not the easiest way of getting
to know Linux. On the other hand: if you make it, you'll have much
deeper understanding of it than someone who just puts an Ubuntu CD on
a modern PC.
I'd say that Lenny should be your choice. This page gives good
instructions for getting started:
And don't hesitate to ask for more help. You'll have to :)