I faced a similar problem recently and wasn't able to finish building Liquid Haskell and HIE until I started afresh. I wiped/uninstalled old Haskell platforms, stack and cabal. Then for a system GHC and cabal I used the HVR ppa. You could also use ghcup. See the ghcup page on github which links to the HVR ppa also. See the downloads page at haskell.org, under Linux generic installer, which currently recommends using ghcup. (I liked the flavour of the HVR ppa more so went with that. )

For anything else I'm using the latest stack.

I think my setup is much cleaner as a result, and tools better organised.

Regards,

Graham

On Mon, Jan 28, 2019, 11:12 Lawrence Bottorff <borgauf@gmail.com wrote:

I'm on Ubuntu 18.10 and I've made a real mess of my Haskell install. In the past I believe I installed from source. Then I must have tried to install through Ubuntu's repo, then I installed through the Haskell tool stack (curl -sSL https://get.haskellstack.org/ | sh). Now I can type ghci at the command line and I get 8.4.2, through stack ghci I get version 8.0.1, while starting a ghci REPL in Emacs goes with the 8.4.2. The Ubuntu repo version seems to be 8.2.2, BTW. What can I do/what should I do to straighten this out? What is the definitive install of Haskell, stack or Haskell platform, and what role should cabal play?

LB
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