$ sudo apt-get update
$ sudo apt-get install libghc-markdown-prof 

libghc-markdown-prof is installed in your system.

Make ensure the libghc-markdown-prof package were installed using the commands given below,

$ sudo dpkg-query -l | grep libghc-markdown-prof *

You will get with libghc-markdown-prof package name, version, architecture and description in a table

libghc-markdown-prof package basic information: