What's up?
Okay so the basics is you have to install compass, which needs ruby,rubygems and also install nodeJS, which means pulling it off from the repository of node (and configuring, making, make-installing).
We could use rvm to install ruby, but that's not necessary unless you plan to also try out different ruby versions and different ruby gems (to see what works).
I found one caveat which is the install of jpeg-turbo. On a mac using brew this must be what they call it, but on ubuntu it seems this package is known as libturbojpeg. all the rest are apt-getable. And another thing, don't install node from the ubuntu repo. You have to do the source compiling yourself to be up to date with 0.8.x version.
Phantom JS was found to be part of apt-get and so I installed it with that instead. This will automatically install its dependencies
Enjoy.