In general, you need a version of cabal that matches the version of GHC. My guess is you have cabal-install-1.16 earlier on PATH than the cabal-install that comes with Haskell Platform, and that removing it will solve your problem. If you answer these questions, that will help me give more specific advice: How did you install Haskell Platform (Ubuntu 14.04 package? PPA? tarball?) What is the output of the following commands: which ghc which cabal ghc --version cabal --version echo $PATH cheers, bergey On 2016-04-27 at 08:08, Juan Carlos Saenz Carrasco wrote:

Hello

I have tried to update, upgrade, and finally uninstall and reinstall again haskell platform in order to get the latest version for cabal since the current version 1.16 (running under Ubuntu 14.04 ) always triggers the following error message not matter what package I try to install:

ghc: ghc no longer supports single-file style package databases (dist/ package.conf.inplace) use 'ghc-pkg init' to create the database with the correct format. Failed to install XXX ... ExitFailure 1

I have also tried 

cabal install cabal-install-1.22.0.0 --global --force-reinstalls

but again, it fails.

Thanks,

JC

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