Follow Phusion Passenger URL for Ubuntu setup https://www.phusionpassenger.com/library/install/nginx/install/oss/trusty/ ( If in future above URL is not present then visit to Phusion Passenger site to select Ubuntu OS and futher instaltion steps.)
- sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 561F9B9CAC40B2F7
- sudo apt-get install -y apt-transport-https ca-certificates
- sudo sh -c 'echo deb https://oss-binaries.phusionpassenger.com/apt/passenger trusty main > /etc/apt/sources.list.d/passenger.list'
- sudo apt-get update