ghc-haddock software package provides Documentation tool for annotated Haskell source code, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install ghc-haddock
ghc-haddock is installed in your system.
Make ensure the ghc-haddock package were installed using the commands given below,
$ sudo dpkg-query -l | grep ghc-haddock *
You will get with ghc-haddock package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Haskell |
| Package | ghc-haddock |
| Version | 7.6.3-10 |
| Description | Documentation tool for annotated Haskell source code |
| Sub Section | Haskell |