Installing Passenger for Apache on Ubuntu (Using apt get deb packages)

In order to run rack-based webframeworks in production on Ubuntu using Apache it is necessary to install passenger. The quickest way to do so is to install the 'libapache2-mod-passenger' debian package.

 $ sudo apt-get install libapache2-mod-passenger

One problem (currently) with using the 'deb' packages and 'apt-get' on Ubuntu is that they will not work, or work after making significant fixes for Rails. Hopefully, the next version of Ubuntu (14.04) will fix this issue. This will work for Sinatra though.