Install libghc-parallel-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-parallel-doc
Description:
Haskell parallel programming library for GHC; documentation
Provides a library for parallel programming in Haskell. . This package provides the documentation for a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: http://hackage.haskell.org/package/parallel
Version: 3.2.1.1-1
Section: universe/doc