title: Upgrade ruby for Orange pi ubuntu
body: <p>Trying to install huginn on orangePI (ubuntu), but it requires <code>Ruby version &gt;= 2.2.2</code>, while I have 2.1.2
  So I tryed to install new ruby 2.3.3, it takes a long and it goes to <code>/usr/local/rvm/rubies/ruby-2.3.3</code></p>
  
  <p>now running bundle to build huginn and it says:
  <code>bash: /usr/local/bin/bundle: /usr/bin/ruby2.1: bad interpreter: No such file or directory</code></p>
  
  <p>so I tryed to set ruby 2.3.3 as default:
  <code>rvm --default use 2.3.3</code>
  result are:
  <code>bash: rvm: command not found</code></p>
  
  <p>I tryed add path, but still no luck:
  <code>echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] &amp;&amp; . "$HOME/.rvm/scripts/rvm" # Load RVM function' &gt;&gt; ~/.bashrc</code></p>
  
  <p>I found rvm in <code>/usr/local/rvm/bin/rvm/</code>
  tryed running it: 
  <code>/usr/local/rvm/bin/rvm use ruby-2.3.3</code>
  result are: <code>Unknown ruby interpreter version (do not know how to handle): [2.2.2,RUBY_VERSION].max.
  RVM is not a function, selecting rubies with 'rvm use ...' will not work.</code></p>
  
  <p>So after a for days of searching how build huginn I'm stacked on ruby. I have ruby 2.3.3 but bundle now says:
  <code>bash: /usr/local/bin/bundle: /usr/bin/ruby2.1: bad interpreter: No such file or directory</code></p>
  
  <p>Just have not idea how to fix ruby, because rvm says:
  <code>bash: rvm: command not found</code></p>
  
  <p>Any help will be appreciated</p>