Guys, I installed a package "certbot" by apt-get, It worked properly, so later I installed "pip" package by apt-get as well. All of a sudden "certbot" is not working anymore, returning the following log:
> certbot
Traceback (most recent call last):
File "/usr/local/bin/certbot", line 6, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3019, in <module>
@_call_aside
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3003, in _call_aside
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