How to Install Ruby 2.1.4 on Ubuntu 14.04

How to install Ruby 2.1.4 on Ubuntu 14.04

First of all, install the prerequisite libraries:

sudo apt-get update
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev

Then install rbenv, which is used to install Ruby:

cd
git clone https://github.com/rbenv/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
exec $SHELL

git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
exec $SHELL

rbenv install 2.3.1
rbenv global 2.3.1
ruby -v

Then (optional) tell Rubygems to not install local documentation:

echo "gem: --no-ri --no-rdoc" > ~/.gemrc

Credits: https://gorails.com/setup/ubuntu/14.10

Warning!!!
There are issues with Gnome-Shell. See comment below.

How to install version specified Ruby using apt

The specific version of ruby you want to install has to be a package available in your Ubuntu distro's package repository. A quick way to check this is using apt list | grep ruby-full or apt list | grep ruby.

If you don't find the version you're looking for, you can add a repository and download it from there. Brightbox is a widely used repository maintaining several ruby version packages. Their installation docs should help you.

Note: I still recommend that you use a ruby version manager like rbenv or rvm.

How to install version specified Ruby in ubuntu

You can install rbenv which is a Ruby Environment and then you can install the version of Ruby you want over it.

Refer to this answer

Installing Jekyll on Ubuntu 14.04

I did try installing a couple different versions. Would this cause a

problem?

No

Follow the given step would help.

1: gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

2: \curl -sSL https://get.rvm.io | bash # install RVM (development version)

3: rvm get head # Make Sure RVM up to date

4: rvm install ruby # will install latest version of ruby

5: rvm list # Listing install rubies will you get versions of ruby which is installed by RVM

6: rvm use < ruby-version > # for instances ruby-1.9.3-p125

7: gem install jekyll

Edit Update As you edited answer in your senerio

trevor~$ rvm list

rvm rubies

   ruby-2.0.0-p643 [ x86_64 ]
   ruby-2.2.1 [ x86_64 ]
=* ruby-2.2.4 [ x86_64 ]

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rvm use 2.2.1
gem install jekyll

Would work !!!

Error installing jekyll on ubuntu 14.04

You have a system ruby at 1.9.3 and 2.3.0 installed with some version manager.

When you call sudo ruby or sudo gem install that's using the system Ruby.

If you just use ruby or gem install that will use the version manager.

In short, just use gem install jekyll --no-rdoc --no-ri without the sudo.

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