redmine install Ubuntu 15.10 - require RMagick is deprecated, please change to require rmagick

I am trying to install redmine (a ruby based bug tracker) on a goDaddy VPS running ubuntu 15.10. I got the app to install on my dev box using Ubuntu 16.04, however GoDaddy does not offer that as an option for VPS.

For the most part things are working and from what I gather, to get over the 500 error I am getting now, I need to run:

sudo RAILS_ENV=production bundle exec rake db:migrate

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And here is where things become harder than the documentation. Now when I run the command I am given the output of:

W: `require 'RMagick'` is deprecated, please change to `require 'rmagick'`

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This is where I am over my head for Linux. I am sure this is an easy fix, but I have no idea where to look. I swear I installed Ruby 2.3.3 before I rebooted, however when I run

ruby -v

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I get

ruby 2.1.5p273 (2014-11-13) [x86_64-linux-gnu]

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. When I run

sudo rails -v

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, I get

Rails 4.1.10

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.

Again, I just want to get this command to run:

sudo RAILS_ENV=production bundle exec rake db:migrate

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, please help.