我正在尝试在virtualenv中安装扭曲，一切似乎都很好，但最后会显示此错误。
命令“python setup.py egg_info”失败，错误代码1在/ tmp / pip-build-14YOyA / twisted /
操作系统是ubuntu 12.04，有人有任何想法吗？
这是显示的文字：
(solidwork)root@rico-TravelMate-5744Z:/home/rico# pip install twisted
Collecting twisted
/home/rico/solidwork/local/lib/python2.7/site-packages/pip/_vendor/urllib3/util/ssl_.py:339: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
SNIMissingWarning
/home/rico/solidwork/local/lib/python2.7/site-packages/pip/_vendor/urllib3/util/ssl_.py:137: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecurePlatformWarning
Downloading Twisted-17.9.0.tar.bz2 (3.0MB)
100% |████████████████████████████████| 3.0MB 77kB/s
Complete output from command python setup.py egg_info:
Couldn't find index page for 'incremental' (maybe misspelled?)
No local packages or download links found for incremental>=16.10.1
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip-build-14YOyA/twisted/setup.py", line 21, in <module>
setuptools.setup(**_setup["getSetupArgs"]())
File "/usr/lib/python2.7/distutils/core.py", line 112, in setup
_setup_distribution = dist = klass(attrs)
File "/home/rico/solidwork/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/setuptools/dist.py", line 221, in __init__
self.fetch_build_eggs(attrs.pop('setup_requires'))
File "/home/rico/solidwork/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/setuptools/dist.py", line 245, in fetch_build_eggs
parse_requirements(requires), installer=self.fetch_build_egg
File "/home/rico/solidwork/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/pkg_resources.py", line 576, in resolve
dist = best[req.key] = env.best_match(req, self, installer)
File "/home/rico/solidwork/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/pkg_resources.py", line 821, in best_match
return self.obtain(req, installer) # try and download/install
File "/home/rico/solidwork/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/pkg_resources.py", line 833, in obtain
return installer(requirement)
File "/home/rico/solidwork/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/setuptools/dist.py", line 294, in fetch_build_egg
return cmd.easy_install(req)
File "/home/rico/solidwork/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/setuptools/command/easy_install.py", line 583, in easy_install
raise DistutilsError(msg)
distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('incremental>=16.10.1')
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-14YOyA/twisted/