mkvirtualenv创建虚拟环境提示404

root@iZ2ze2b0psb88pn1gzr0brZ:~# mkvirtualenv myenv
Running virtualenv with interpreter /usr/bin/python2
New python executable in /root/.virtualenvs/myenv/bin/python2
Also creating executable in /root/.virtualenvs/myenv/bin/python
Please make sure you remove any previous custom paths from your /root/.pydistutils.cfg file.
Installing setuptools, pkg_resources, pip, wheel...
Complete output from command /root/.virtualenvs/myenv/bin/python2 - setuptools pkg_resources pip wheel:
Collecting setuptools
Downloading http://mirrors.aliyun.com/pypi/packages/fc/cb/748dcabb152fbc7eceaf585d052b8bc11cf028b917a7d2343cf1e0c092c3/setuptools-36.0.1-py2.py3-none-any.whl (476kB)
Collecting pkg_resources
Exception:
Traceback (most recent call last):
File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/basecommand.py", line 209, in main

status = self.run(options, args)

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/commands/install.py", line 328, in run

wb.build(autobuilding=True)

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/wheel.py", line 748, in build

self.requirement_set.prepare_files(self.finder)

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/req/req_set.py", line 360, in prepare_files

ignore_dependencies=self.ignore_dependencies))

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/req/req_set.py", line 512, in _prepare_file

finder, self.upgrade, require_hashes)

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/req/req_install.py", line 273, in populate_link

self.link = finder.find_requirement(self, upgrade)

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 442, in find_requirement

all_candidates = self.find_all_candidates(req.name)

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 400, in find_all_candidates

for page in self._get_pages(url_locations, project_name):

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 545, in _get_pages

page = self._get_page(location)

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 648, in _get_page

return HTMLPage.get_page(link, session=self.session)

File "/usr/share/python-wheels/pip-8.1.1-py2.py3-none-any.whl/pip/index.py", line 760, in get_page

resp.raise_for_status()

File "/root/.virtualenvs/myenv/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/models.py", line 840, in raise_for_status

raise HTTPError(http_error_msg, response=self)

HTTPError: 404 Client Error: Not Found for url: http://mirrors.aliyun.com/pypi/simple/pkg-resources/

...Installing setuptools, pkg_resources, pip, wheel...done.
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/virtualenv.py", line 2363, in

main()

File "/usr/lib/python3/dist-packages/virtualenv.py", line 719, in main

symlink=options.symlink)

File "/usr/lib/python3/dist-packages/virtualenv.py", line 988, in create_environment

download=download,

File "/usr/lib/python3/dist-packages/virtualenv.py", line 918, in install_wheel

call_subprocess(cmd, show_stdout=False, extra_env=env, stdin=SCRIPT)

File "/usr/lib/python3/dist-packages/virtualenv.py", line 812, in call_subprocess

% (cmd_desc, proc.returncode))

OSError: Command /root/.virtualenvs/myenv/bin/python2 - setuptools pkg_resources pip wheel failed with error code 2