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The installation steps listed in this article will work for both versions of Ubuntu, 18.04 LTS and 19.04.
A little bit about Ruby from their website:
Ruby is a dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.
And RubyGems from Wikipedia:
RubyGems is a package manager for the Ruby programming language that provides a standard format for distributing Ruby programs and libraries (in a self-contained format called a "gem"), a tool designed to easily manage the installation of gems, and a server for distributing them.
Start off by making sure your version of Ubuntu is up to date, issue the following at the terminal to do so:
sudo apt-get update sudo apt-get upgrade
Now to the actual part, issue the following to install Ruby on your server:
sudo apt-get install ruby
You’ve just installed both Ruby and RubyGems. RubyGems comes bundled with Ruby on Ubuntu.
To verify that both Ruby and RubyGems were successfully installed after the last command, issue the following at the terminal
#Ubuntu 18.04 LTS theshell@ub1804:~$ ruby -v ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux-gnu] theshell@ub1804:~$ gem -v 2.7.6 #Ubuntu 19.04 theshell@ub1904:~$ ruby -v ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-linux-gnu] theshell@ub1904:~$ gem -v 18.104.22.168
That’s it, you’re done!