Now if somebody could tell me how to install the latest haskell platform on Ubuntu 12.04 and why cabal (with the haskell platform for 12.04) always gives me tho

Now if somebody could tell me how to install the latest haskell platform on Ubuntu 12.04 and why cabal (with the haskell platform for 12.04) always gives me those incompatibility warnings, I'd be happy to try it out.