I think my installation was correct. Although the crfsuite link didn't work, so I downloaded it from the official website.
fuqi@fuqi-XPS-13-9380:~/Software/SAPIENTA$ sudo python2 setup.py develop
running develop
running egg_info
writing SAPIENTA.egg-info/PKG-INFO
writing top-level names to SAPIENTA.egg-info/top_level.txt
writing dependency_links to SAPIENTA.egg-info/dependency_links.txt