WPScan utility on Ubuntu
Install Linux Dependencies first
sudo apt-get install libcurl4-openssl-dev libxml2 libxml2-dev libxslt1-dev ruby-dev build-essential
Install from RubyGems:
gem install wpscan
Install from sources:
git clone https://github.com/wpscanteam/wpscan
cd wpscan/
bundle install && rake install