Apparently there was some clash with PIP.
In order to fix I called:
$ sudo pip install twisted
$ sudo pip install cryptography
$ sudo pip uninstall cryptography
$ sudo pip uninstall twisted
And then I reinstalled Ubuntu's packages:
$ sudo apt-get install --reinstall python-cryptography
$ sudo apt-get install --reinstall python-openssl
$ sudo apt-get install --reinstall python-twisted

** Changed in: twisted (Ubuntu)
       Status: New => Fix Released

** Changed in: twisted (Ubuntu)
     Assignee: (unassigned) => Adrian (adrianf0)

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https://bugs.launchpad.net/bugs/1585166

Title:
  AttributeError: 'CompiledFFI' object has no attribute 'def_extern'

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