获取ssl失败

1. 证书获取失败，返回如下错误信息：
   
2. 
   
3. Creating virtual environment...
   
4. Installing Python packages...
   
5. Had a problem while installing Python packages.
   
6. 
   
7. pip prints the following errors:
   
8. =====================================================
   
9. Collecting argparse==1.4.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 11))
   
10. Downloading argparse-1.4.0-py2.py3-none-any.whl
    
11. Collecting pycparser==2.14 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 17))
    
12. Downloading pycparser-2.14.tar.gz (223kB)
    
13. Collecting asn1crypto==0.22.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 21))
    
14. Downloading asn1crypto-0.22.0-py2.py3-none-any.whl (97kB)
    
15. Collecting cffi==1.10.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 24))
    
16. Downloading cffi-1.10.0-cp27-cp27mu-manylinux1_x86_64.whl (392kB)
    
17. Collecting ConfigArgParse==0.12.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 61))
    
18. Downloading ConfigArgParse-0.12.0.tar.gz (41kB)
    
19. Collecting configobj==5.0.6 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 63))
    
20. Downloading configobj-5.0.6.tar.gz
    
21. Collecting cryptography==2.0.2 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 65))
    
22. Downloading cryptography-2.0.2-cp27-cp27mu-manylinux1_x86_64.whl (2.2MB)
    
23. Collecting enum34==1.1.2 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 96))
    
24. Downloading enum34-1.1.2.tar.gz (46kB)
    
25. Collecting funcsigs==1.0.2 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 99))
    
26. Downloading funcsigs-1.0.2-py2.py3-none-any.whl
    
27. Collecting idna==2.5 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 102))
    
28. Downloading idna-2.5-py2.py3-none-any.whl (55kB)
    
29. Collecting ipaddress==1.0.16 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 105))
    
30. Downloading ipaddress-1.0.16-py27-none-any.whl
    
31. Collecting linecache2==1.0.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 108))
    
32. Downloading linecache2-1.0.0-py2.py3-none-any.whl
    
33. Collecting ordereddict==1.1 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 111))
    
34. Downloading ordereddict-1.1.tar.gz
    
35. Collecting packaging==16.8 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 113))
    
36. Downloading packaging-16.8-py2.py3-none-any.whl
    
37. Collecting parsedatetime==2.1 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 116))
    
38. Downloading parsedatetime-2.1-py2-none-any.whl
    
39. Collecting pbr==1.8.1 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 119))
    
40. Downloading pbr-1.8.1-py2.py3-none-any.whl (89kB)
    
41. Collecting pyOpenSSL==16.2.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 122))
    
42. Downloading pyOpenSSL-16.2.0-py2.py3-none-any.whl (43kB)
    
43. Collecting pyparsing==2.1.8 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 125))
    
44. Downloading pyparsing-2.1.8-py2.py3-none-any.whl (54kB)
    
45. Collecting pyRFC3339==1.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 134))
    
46. Downloading pyRFC3339-1.0-py2.py3-none-any.whl
    
47. Collecting python-augeas==0.5.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 137))
    
48. Downloading python-augeas-0.5.0.tar.gz (90kB)
    
49. Collecting pytz==2015.7 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 139))
    
50. Downloading pytz-2015.7-py2.py3-none-any.whl (476kB)
    
51. Collecting requests==2.12.1 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 153))
    
52. Downloading requests-2.12.1-py2.py3-none-any.whl (574kB)
    
53. Collecting six==1.10.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 156))
    
54. Downloading six-1.10.0-py2.py3-none-any.whl
    
55. Collecting traceback2==1.4.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 159))
    
56. Downloading traceback2-1.4.0-py2.py3-none-any.whl
    
57. Collecting unittest2==1.1.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 162))
    
58. Downloading unittest2-1.1.0-py2.py3-none-any.whl (96kB)
    
59. Collecting zope.component==4.2.2 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 165))
    
60. Downloading zope.component-4.2.2.tar.gz (546kB)
    
61. Collecting zope.event==4.1.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 167))
    
62. Downloading zope.event-4.1.0.tar.gz (476kB)
    
63. Collecting zope.interface==4.1.3 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 169))
    
64. Downloading zope.interface-4.1.3.tar.gz (141kB)
    
65. Collecting mock==1.3.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 188))
    
66. Downloading mock-1.3.0-py2.py3-none-any.whl (56kB)
    
67. Collecting letsencrypt==0.7.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 199))
    
68. Downloading letsencrypt-0.7.0-py2-none-any.whl
    
69. Collecting certbot==0.20.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 203))
    
70. Downloading certbot-0.20.0-py2.py3-none-any.whl (280kB)
    
71. Collecting acme==0.20.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 206))
    
72. Downloading acme-0.20.0-py2.py3-none-any.whl (100kB)
    
73. Collecting certbot-apache==0.20.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 209))
    
74. Downloading certbot_apache-0.20.0-py2.py3-none-any.whl (209kB)
    
75. Collecting certbot-nginx==0.20.0 (from -r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 212))
    
76. Downloading certbot_nginx-0.20.0-py2.py3-none-any.whl (65kB)
    
77. Requirement already satisfied: setuptools in /opt/eff.org/certbot/venv/lib/python2.7/site-packages (from zope.component==4.2.2->-r /tmp/tmp.7picFJwbjr/letsencrypt-auto-requirements.txt (line 165))
    
78. Installing collected packages: argparse, pycparser, asn1crypto, cffi, ConfigArgParse, six, configobj, idna, ipaddress, enum34, cryptography, funcsigs, linecache2, ordereddict, pyparsing, packaging, parsedatetime, pbr, pyOpenSSL, pytz, pyRFC3339, python-augeas, requests, traceback2, unittest2, zope.interface, zope.event, zope.component, mock, acme, certbot, letsencrypt, certbot-apache, certbot-nginx
    
79. Running setup.py install for pycparser: started
    
80. Running setup.py install for pycparser: finished with status 'done'
    
81. Running setup.py install for ConfigArgParse: started
    
82. Running setup.py install for ConfigArgParse: finished with status 'done'
    
83. Running setup.py install for configobj: started
    
84. Running setup.py install for configobj: finished with status 'done'
    
85. Running setup.py install for enum34: started
    
86. Running setup.py install for enum34: finished with status 'done'
    
87. Running setup.py install for ordereddict: started
    
88. Running setup.py install for ordereddict: finished with status 'done'
    
89. Running setup.py install for python-augeas: started
    
90. Running setup.py install for python-augeas: finished with status 'done'
    
91. Running setup.py install for zope.interface: started
    
92. =====================================================
    
93. 
    
94. Certbot has problem setting up the virtual environment.
    
95. 
    
96. We were not be able to guess the right solution from your pip
    
97. output.
    
98. 
    
99. Consult https://certbot.eff.org/docs/install.html#problems-with-python-virtual-environment
    
100. for possible solutions.
     
101. You may also find some support resources at https://certbot.eff.org/support/ .

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使用Let's Encrypt免费证书免费证书，不知道为什么会出现上面的错误？