Launch error: libffi.so.6: cannot open shared object

Ubuntu desktop 20.04.1 all up to date @ 29/10/2020 with kernel 5.4.0-52-generic

after installing hpack, launching of hpack results into this error:

error while loading shared libraries: libffi.so.6: cannot open shared object file: No such file or directory

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: hpack 0.31.2-1
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 29 14:41:16 2020
Dependencies:

InstallationDate: Installed on 2020-03-14 (228 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200309)
SourcePackage: haskell-hpack
UpgradeStatus: No upgrade log present (probably fresh install)