Sudo certbot renew --dry-run : ContextualVersionConflict: (cryptography 2.1.4 (/usr/lib/python2.7/dist-packages)

Ubuntu 18.04.02 Server Edition, nginx/1.14.0 (Ubuntu) , domain: (under heavy development)

As follow-up of my previous attempts to automate certificates renewal (Certbot-renewal.service: Failed with result 'exit-code + How to be sure that the automatic certificates renewal process is correctly set? Ubuntu 18.04.02 Server ) , I installed certbot via sudo pip install .

marco@pc:~$ sudo certbot renew --dry-run
An unexpected error occurred:
ContextualVersionConflict: (cryptography 2.1.4 (/usr/lib/python2.7/dist-packages),
Requirement.parse(‘cryptography>=2.3’), set([‘PyOpenSSL’]))
Please see the logfile ‘/tmp/tmp2KOWbQ’ for more details.

sudo nano /tmp/tmp2KOWbQ :

2019-08-03 18:20:41,154:DEBUG:certbot.log:Exiting abnormally:
Traceback (most recent call last):
  File "/usr/local/bin/certbot", line 11, in <module>
  File "/usr/local/lib/python2.7/dist-packages/certbot/", line 1351, in main
    plugins = plugins_disco.PluginsRegistry.find_all()
  File "/usr/local/lib/python2.7/dist-packages/certbot/plugins/", line 208, in find_all
    plugin_ep = PluginEntryPoint(entry_point)
  File "/usr/local/lib/python2.7/dist-packages/certbot/plugins/", line 50, in __init__
    self.plugin_cls = entry_point.load()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/", line 2323, in load
    self.require(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/", line 2346, in require
    items = working_set.resolve(reqs, env, installer, extras=self.extras)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/", line 783, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
ContextualVersionConflict: (cryptography 2.1.4 (/usr/lib/python2.7/dist-packages),   
Requirement.parse('cryptography>=2.3'), set(['PyOpenSSL']))
2019-08-03 18:20:41,154:ERROR:certbot.log:An unexpected error occurred:

Looking forward to your kind help.

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