Installing ubuntu on iMac hardware?

Hey guys

I know since Intel chip, it is possible to install windows on an iMac.

I also tested (I did not use it, because of reasons) whether it is true that it is possible to install Osx leopard on a pc (intel pc). I did that, actually, it is about modifying the kex files to hack the hardware key

my question: is it possible to install ubuntu, or other unix descendent to apple hardware?

(I've seen android ruing on an iPhone 3!)

best, thx, peace: K