ghc-mod software package provides Happy Haskell programming on Emacs, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install ghc-mod
ghc-mod is installed in your system.
Make ensure the ghc-mod package were installed using the commands given below,
$ sudo dpkg-query -l | grep ghc-mod *
You will get with ghc-mod package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Haskell |
| Package | ghc-mod |
| Version | 1.0.5-1 |
| Description | Happy Haskell programming on Emacs |
| Sub Section | haskell |