Should we use the Fedora 27 bindist for Ubuntu?
The current bindist for ubuntu (https://downloads.haskell.org/~ghc/8.6.5/ghc-8.6.5-x86_64-deb9-linux.tar.xz) tries to use `libtinfo.so.5`, but since at least 16.04, Ubuntu provides `libtinfo.so.6` but not `libtinfo.so.5`.
The Fedora 27 bindist (https://downloads.haskell.org/~ghc/8.6.5/ghc-8.6.5-x86_64-fedora27-linux.tar.xz) uses `libtinfo.so.6`, and is what stack uses.
issue