Install Ubuntu on Chromebook

Install Ubuntu on Samsung series 5:
http://www.devchronicles.com/2011/10/installing-ubuntu-on-samsung-series-5.html

I followed the instructions on my Samsung series 5 550, it works as well.

Another new instruction for installing:
http://chromeos-cr48.blogspot.com/2012/04/chrubuntu-1204-now-with-double-bits.html?