I spent a while figuring out that if you install ruby1.9 then you will have troubles down the road. So then I tryed to use rbenv to install ruby2.2 but that didn’t work out. So I ended up finding a PPA and installed it that way.
Install the prerequisites
sudo apt-get install build-essentials gcc make git
Add the Brightbox PPA and Install ruby and ruby-dev
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.2 ruby2.2-dev
Install nodejs
sudo apt-get install nodejs
Install Jekyll and JSON
sudo gem install jekyll
sudo gem install json
OPTIONAL (this will install extras but is not required)
sudo apt-get install zlib1g-dev
sudo gem install github-pages
To Run Jekyll
jekyll serve --watch
--watch will regenerate the blog when you make changes