Ubuntu precise specific

I think it might be a good idea to make it known in the help text that the instructions for ubuntu are ubuntu precise specific. Because I had trouble with the instructions on ubuntu 13.10. On 13.10 I had to install "software-properties-common" instead of "python-software-properties".

And on 13.10 I had to do 'sudo apt-add-repository "deb http://ppa.launchpad.net/hvr/ghc/ubuntu precise main"' to point the source list to the precise packages and I also had to run "sudo add-apt-repository -y ppa:hvr/ghc" to download the pubkey for verifying the installed packages.

Or perhaps it is mentioned somewhere that these instructions are "ubuntu precise" specific. If it is, it is not obvious.

Thank you