There are multiple approaches, but my biased[1] recommendation is to use Stack, which can automatically install the appropriate GHC version. There are instructions available at:

https://haskell-lang.org/get-started/linux

I'd also recommend checking out the "next steps" section for how to get started using Stack. Also, there's a Gitter channel where you can ask follow up questions at:

https://gitter.im/commercialhaskell/stack

[1] I'm one of the Stack authors

On Mon, Feb 4, 2019 at 6:46 PM Lawrence Bottorff <borgauf@gmail.com> wrote:
So I've got a new machine with a fresh install of Ubuntu 18.10. How should I install latest-greatest Haskell? (Perhaps review my previous post about having so much trouble with conflicting Haskell install theories.)

LB
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