Cannot install devstack (lab 2.2), problem with barbican

I tried two times but still have problem.
This is the short version of the log
2019-01-05 14:09:50.827 | Obtaining file:///opt/stack/barbican
2019-01-05 14:09:51.681 | Complete output from command python setup.py egg_info:
2019-01-05 14:09:51.681 | /usr/local/lib/python2.7/dist-packages/setuptools/dist.py:42: DistDeprecationWarning: Do not call this function
2019-01-05 14:09:51.682 | warnings.warn("Do not call this function", DistDeprecationWarning)
2019-01-05 14:09:51.682 | ERROR:root:Error parsing
2019-01-05 14:09:51.682 | Traceback (most recent call last):
2019-01-05 14:09:51.682 | File "/usr/local/lib/python2.7/dist-packages/pbr/core.py", line 111, in pbr
2019-01-05 14:09:51.682 | attrs = util.cfg_to_args(path, dist.script_args)
2019-01-05 14:09:51.682 | File "/usr/local/lib/python2.7/dist-packages/pbr/util.py", line 267, in cfg_to_args
2019-01-05 14:09:51.682 | wrap_commands(kwargs)
2019-01-05 14:09:51.682 | File "/usr/local/lib/python2.7/dist-packages/pbr/util.py", line 569, in wrap_commands
2019-01-05 14:09:51.682 | cmdclass = ep.resolve()
2019-01-05 14:09:51.682 | File "/usr/local/lib/python2.7/dist-packages/pkg_resources/init.py", line 2352, in resolve
2019-01-05 14:09:51.682 | module = import(self.module_name, fromlist=['name'], level=0)
2019-01-05 14:09:51.682 | File "/usr/local/lib/python2.7/dist-packages/flake8/main.py", line 6, in
2019-01-05 14:09:51.682 | import pep8
2019-01-05 14:09:51.682 | ImportError: No module named pep8
2019-01-05 14:09:51.682 | error in setup command: Error parsing /opt/stack/barbican/setup.cfg: ImportError: No module named pep8
2019-01-05 14:09:51.682 |
2019-01-05 14:09:51.682 | ----------------------------------------
2019-01-05 14:09:51.682 | Command "python setup.py egg_info" failed with error code 1 in /opt/stack/barbican/
2019-01-05 14:09:51.814 | You are using pip version 9.0.3, however version 18.1 is available.
2019-01-05 14:09:51.815 | You should consider upgrading via the 'pip install --upgrade pip' command.
Attached zip file is the full version of the installation log.
Comments
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(1) Yes, you need to upgrade python pip using the details mentioned here .. pip install --upgrade pip
(2) And if after that you get error something like "pip: no module named _internal", then possibly there is a version conflict between python pip, so refer to below thread
https://stackoverflow.com/questions/49940813/pip-no-module-named-internalBelow worked for me ...
LINUX> curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py // get latest pip
LINUX> python2.7 get-pip.py --force-reinstall // force re-install pip
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