I generally do most everything from a shell. I also generally script things when I can. However, I wanted to see changes made to arachni web interface and it had been a while since I used it. I’m not sure if this is automated via the links included in kali linux or not, I just know that when I went to fire up arachni_web it failed and this is how I fixed it.
cd /usr/share/arachni/system/arachni-ui-web apt-get install postgresql-server-dev-9.1 libsqlite3-dev bundle install arachni_web_create_user firstname.lastname@example.org Y0uRp455w0rD 'Your Name' arachni_web &
Then open up your favorite web browser and go to: