Emacs hangs when loading haskell files

[salva]

When I open a haskell file on emacs it hangs after displaying the "Initializing" message.

I reported the issue upstream and the author replied that it may be a packing issue:

https://github.com/DanielG/ghc-mod/issues/923#issuecomment-438016460

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ghc-mod 5.8.0.0-1
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Nov 13 13:01:32 2018
InstallationDate: Installed on 2014-02-24 (1722 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131219)
SourcePackage: ghc-mod
UpgradeStatus: Upgraded to bionic on 2018-07-02 (133 days ago)