Contextual Version Conflic

I am trying to test my new extension on a clean ubuntu v18.04.5 Azure VM, but I get an error when I try to run the extension:

(myenv) user@testvm:~/cli/azure-cli-extensions$ az ssh -h
Traceback (most recent call last):
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 568, in _build_master
    ws.require(__requires__)
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 886, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 777, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (cryptography 2.8 (/home/vthiebaut/cli/myenv/lib/python3.6/site-packages), Requirement.parse('cryptography<3.4,>=3.2'), {'azure-cli-core'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user/cli/myenv/bin/az", line 4, in <module>
    __import__('pkg_resources').require('azure-cli==2.26.0')
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3242, in <module>
    @_call_aside
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3226, in _call_aside
    f(*args, **kwargs)
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3255, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 570, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 583, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/home/user/cli/myenv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 777, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (cryptography 2.8 (/home/user/cli/myenv/lib/python3.6/site-packages), Requirement.parse('cryptography<3.4,>=3.2'), {'azure-cli-core'})

It seems that pip install azdev is not installing the correct version of the cryptography package. The logs generated by the pip command had this lines:

Collecting cryptography>=2.1.4
  Downloading cryptography-3.4.7-cp36-abi3-manylinux2014_x86_64.whl (3.2 MB) 

I tried manually installing version 2.8, but that doesn't work either. What should I do in this case?

azdev version:

0.1.34

Python (Linux) 3.6.9 (default, Jan 26 2021, 15:33:00)
[GCC 8.4.0]

How can I solve this problem?

Beginne damit, az ssh -h in der sauberen Ubuntu-18.04.5-VM mit azdev 0.1.34 zu reproduzieren. Untersuche anschließend, wie pip install azdev die Abhängigkeit cryptography für den az-Einstiegspunkt auflöst. Als erledigt gilt die Aufgabe, wenn die Umgebung die Versionsanforderung von azure-cli-core erfüllt und az ssh -h ohne den ContextualVersionConflict ausgeführt wird.