$ sudo apt-get install python-dev libffi-dev build-essential virtualenvwrapper
$ mkdir ~/.environments
$ sudo find / -name "virtualenvwrapper.sh"
/usr/share/virtualenvwrapper/virtualenvwrapper.sh
$ echo source /usr/share/virtualenvwrapper/virtualenvwrapper.sh >> ~/.bashrc
$ echo export WORKON_HOME="~/.environments" >> ~/.bashrc
$ source ~/.bashrc 
$ mkvirtualenv angr && pip install angr