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I use ubuntu 18.04. I recently installed certbot to create an SSH and it worked. Then I decide to install python-pip and certbot-dns-cloudflare using this command

sudo apt install python-pip
sudo pip install certbot-dns-cloudflare

after installing, when I ran certbot I always get the error

An unexpected error occurred:
ContextualVersionConflict: (cryptography 2.1.4 (/usr/lib/python2.7/dist-packages), Requirement.parse('cryptography>=2.2.1'), set(['PyOpenSSL']))
Please see the logfile '/tmp/tmpg0HmH3' for more details.

the log file output:

2019-01-08 01:54:07,629:DEBUG:certbot.log:Exiting abnormally:
Traceback (most recent call last):
  File "/usr/local/bin/certbot", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/certbot/main.py", line 1334, in main
    plugins = plugins_disco.PluginsRegistry.find_all()
  File "/usr/local/lib/python2.7/dist-packages/certbot/plugins/disco.py", line 206, in find_all
    plugin_ep = PluginEntryPoint(entry_point)
  File "/usr/local/lib/python2.7/dist-packages/certbot/plugins/disco.py", line 52, in __init__
    self.plugin_cls = entry_point.load()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2323, in load
    self.require(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2346, in require
    items = working_set.resolve(reqs, env, installer, extras=self.extras)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", 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>=2.2.1'), set(['PyOpenSSL']))
2019-01-08 01:54:07,629:ERROR:certbot.log:An unexpected error occurred:

even when I uninstalled python-pip certbot-dns-cloudflare and certbot using

sudo pip uninstall certbot-dns-cloudflare
sudo apt remove python-pip
sudo apt remove certbot

I still got the same error, shouldn't it tells me that the program is not installed?

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