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Install Ruby

We can directly use gem to install Ruby，but Ruby on ubuntu14.14 are at 1.9 version, higher than 2.2 version is expected.

• download ruby package.I chosed the version 2.3.0.
  Clicke the link to download it or use wget :
  wget https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0.tar.gz

• utar it to /opt/
  tar -xvfz ruby-2.3.0.tar.gz

• change workdir to ruby-2.3.0，configure， make， make install
  ./configure
  make
  sudo make install

• Check the installed version
  $ /opt/ruby-2.3.0$ ruby -v

ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]

Install rubygems

Download it from official site ， or use git.

cd ~/Downloads/ && git clone https://github.com/rubygems/rubygems.git

after downloading, switch to the director and run:

ruby setup.rb

Install jekyll

sudo gem install jekyll

May there be some error :

ERROR: Loading command: update (LoadError)
cannot load such file -- zlib
ERROR: While executing gem ... (NoMethodError)
undefined method `invoke_with_build_args' for nil:NilClass

Get into ruby-xx/ext/zlib/ , run the command below:

ruby extconf.rb
make
sudo make install

And we may meet other problem, Install sql related package:

sudo apt-get install libmysqlclient-dev

if still be error like:

ERROR: While executing gem ... (Gem::Exception)
Unable to require openssl, install OpenSSL and rebuild ruby (preferred) or use non-HTTPS sources

run the command below:

gem source -r https://rubygems.org/
gem source -a http://rubygems.org/

Then install jekyll

sudo gem install jekyll

after that, check the jekyll version

jekyll -v

Jekyll 3.1.3