CentOS 7 安装 certbot 证书 The ‘urllib3<1.23,>=1.21.1′ distribution was not found and is required by requests
安装 certbot 证书,错误信息 Traceback (most recent call last): File “/usr/bin/certbot”, line 5, in <module> from pkg_resources import load_entry_point File “/usr/lib/python2.7/site-packages/pkg_resources/__init__.py”, line 3138, in <module> @_call_aside File “/usr/lib/python2.7/site-packages/pkg_ …