How to install Jekyll

sudo apt-get install ruby-full
sudo apt-get install rubygems build-essential

sudo apt-get install gcc

sudo apt-get install make

sudo gem install jekyll bundler

all the above commands are not working and I don't know why ????

Luckily I found this solution 

https://stackoverflow.com/questions/34521806/installing-jekyll-on-ubuntu-14-04/34523631#34523631

jekyll new blog

cd blog

bundle exec jekyll serve

EUREKA!!!