Ruby
$ sudo add-apt-repository -y ppa:brightbox/ruby-ng $ sudo apt-get update $ sudo apt-get install ruby2.3
Nokogiri
$ sudo apt-get install ruby2.3-dev zlib1g-dev build-essential patch $ sudo gem install mini_portile2 $ sudo gem install nokogiri
$ sudo add-apt-repository -y ppa:brightbox/ruby-ng $ sudo apt-get update $ sudo apt-get install ruby2.3
$ sudo apt-get install ruby2.3-dev zlib1g-dev build-essential patch $ sudo gem install mini_portile2 $ sudo gem install nokogiri