Had the same problem. This worked

1. uninstalling haskell-cabal with apt

2. installing it agains with curl

    curl -sSL https://get.haskellstack.org/ | sh

as it is recommended (https://docs.haskellstack.org/en/stable/README
/#how-to-install)

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https://bugs.launchpad.net/bugs/1786197

Title:
  stack 1.5.1 broken on 18.04  (AesonException)

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