Installing GHC 8.8.4 and cabal-install to Ubuntu 20.04 LTS

There’re several ways to install any version of GHC to Ubuntu including using Stack, but one of the ways is to use ppa:hvr/ghc to install bare GHC and cabal-install.

sudo add-apt-repository ppa:hvr/ghc
sudo apt update
sudo apt install cabal-install-3.4 ghc-8.8.4

You may want to install ghc-8.8.4-prof package as well when you build your app with profiling enabled.