TIL that Ubuntu 13.10 is not a target for GHC. There's just no way to install it without removing half of the system libraries. At least, no easy way. Though I've successfully installed it in a few clicks via Haskell Platform in a Windows under VM. So, beware: there're potentailly only 3 good Linux distribs: NixOS, ArchLinux, Gentoo. It's damn right time to check these out.