ERROR: Command errored out with exit status 1:
     command: /usr/bin/python2.7 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-FGsCXn/twisted/setup.py'"'"'; __file__='"'"'/tmp/pip-install-FGsCXn/twisted/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-FGsCXn/twisted/pip-egg-info
         cwd: /tmp/pip-install-FGsCXn/twisted/
    Complete output (23 lines):
    Couldn't find index page for 'incremental' (maybe misspelled?)
    No local packages or working download links found for incremental>=16.10.1
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-FGsCXn/twisted/setup.py", line 21, in <module>
        setuptools.setup(**_setup["getSetupArgs"]())
      File "/usr/lib/python2.7/distutils/core.py", line 111, in setup
        _setup_distribution = dist = klass(attrs)
      File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 317, in __init__
        self.fetch_build_eggs(attrs['setup_requires'])
      File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 372, in fetch_build_eggs
        replace_conflicting=True,
      File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 846, in resolve
        dist = best[req.key] = env.best_match(req, ws, installer)
      File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 1118, in best_match
        return self.obtain(req, installer)
      File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 1130, in obtain
        return installer(requirement)
      File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 440, in fetch_build_egg
        return cmd.easy_install(req)
      File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 693, in easy_install
        raise DistutilsError(msg)
    distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('incremental>=16.10.1')
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
WARNING: You are using pip version 19.3.1; however, version 20.3.4 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.