error pip3 install paramiko for python3

どうやら、pipが古すぎるらしい。「pip3 install --upgrade pip」で解消

# pip3 install paramiko
WARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.
Collecting paramiko
  Using cached https://files.pythonhosted.org/packages/72/b5/7b99a3da446338c8b5c73da549e8bc8d8c3a066a9d535e64191ac3b77137/paramiko-2.8.0-py2.py3-none-any.whl
Collecting bcrypt>=3.1.3 (from paramiko)
  Using cached https://files.pythonhosted.org/packages/52/a7/51ab6481ac355517696477889d8ab232106a0ddadda642c54e47a2ab40b9/bcrypt-3.2.0-cp36-abi3-manylinux1_x86_64.whl
Collecting cryptography>=2.5 (from paramiko)
  Using cached https://files.pythonhosted.org/packages/10/91/90b8d4cd611ac2aa526290ae4b4285aa5ea57ee191c63c2f3d04170d7683/cryptography-35.0.0.tar.gz
    Complete output from command python setup.py egg_info:
    
            =============================DEBUG ASSISTANCE==========================
            If you are seeing an error here please try the following to
            successfully install cryptography:
    
            Upgrade to the latest pip and try again. This will fix errors for most
            users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
            =============================DEBUG ASSISTANCE==========================
    
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-unu1qvmi/cryptography/setup.py", line 14, in <module>
        from setuptools_rust import RustExtension
    ModuleNotFoundError: No module named 'setuptools_rust'
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-unu1qvmi/cryptography/

# pip3 install --upgrade pip