[Haskell-beginners] Can't remove old haskell

[Lawrence Bottorff]

I've followed the steps here
<https://www.haskell.org/platform/linux.html#linux-generic>; however, it
doesn't replace or supercede an older version of ghci from my Ubuntu 18.04:

12:47:02:~$ which ghci
/opt/ghc/8.0.2/bin/ghci
12:47:14:~$ ghci --version
The Glorious Glasgow Haskell Compilation System, version 8.0.2

I've tried various removes, but to no avail. The newer version is on my
system:

12:50:32:/usr/local/haskell/ghc-8.4.2-x86_64/bin$ ./ghci --version
The Glorious Glasgow Haskell Compilation System, version 8.4.2

But I don't know what to do about this old "default" version.

LB
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