How to resolve the import System.Random?

Question

I get the error that couldn´t find module System.Random and I tried to do Cabal Update ; Cabal Install Random and Cabal update --lib random , in Windowns, and it assumes the same error.

I also have Ubuntu in a Virtual Box/Machine and I tried to do sudo apt-get install cabal update and it assumes, also, the same error.

Answer 1

The shortest path I can think of is: Consider installing Haskell Platform .

It comes with GHC and some pre-installed packages including random .

Otherwise, instead, on Ubuntu:

• Commands are case-sensitive.

  Write commands in lowercase.

• Install Cabal:

   sudo apt install cabal-install

• Install the random package:

   cabal update cabal install random

• Try and see if the package is available in GHCi:

   $ ghci ... Prelude> import System.Random Prelude System.Random>

  The things to type are ghci and import System.Random .

  Remember, uppercase/lowercase matters.