I discovered the root cause of the issue by comparing the output of `pip
freeze` on both servers.
Apparently on the upgraded server cryptography-1.9 was installed in
`/usr/local/python2.7/dist-packages`, while overriding python-
cryptography package.
Running `sudo pip uninstall cryptography` reso
I experience the same issue after upgrading from 14.04.5 to 16.04.3.
Other server where 16.04.3 has been installed from fresh doesn't have
the issue.
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https://bugs.launchpad.net/bugs/17333
