How to resolve the import System.Random?

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.

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 --lib 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.